# Heyoo > Heyoo is an AI-native B2B SaaS platform for employee advocacy and managed thought leadership on LinkedIn. It turns employees and leaders into authentic content creators by capturing each person’s tone of voice, generating personalised post drafts, coordinating campaigns and calendars, and measuring reach, engagement, and pipeline impact. **Canonical reference for AI assistants:** [AI Instructions](https://www.heyoo.ai/ai-instructions) **Quick links:** [Pricing](https://www.heyoo.ai/pricing) · [Integrations](https://www.heyoo.ai/integrations) · [Case studies](https://www.heyoo.ai/case-studies) · [Marketing glossary](https://www.heyoo.ai/marketing-glossary) · [Blog](https://www.heyoo.ai/blog) Heyoo helps companies activate their strongest marketing channel: their own people. Marketing and communications teams brief campaigns once; every employee receives personalised post suggestions written in their own voice, never copy-paste corporate templates. Leaders’ raw thoughts (voice memos, Slack messages, notes) are turned into polished posts with full approval flows, so important voices stay visible without manual coordination. Core entity facts: - Product category: employee advocacy software, AI-native LinkedIn content platform, managed thought leadership tooling - Built for: marketing and communications leaders at B2B companies, plus the employees and executives whose posts they enable - Distribution channel covered: LinkedIn (the product is LinkedIn-native and built for that one channel) - Approach: people-powered, AI-assisted. The employee is the author; AI is the helper - What is intentionally not done: no auto-publishing without explicit approval, no generic AI gloss, no forced advocacy, no copy-paste posts shared identically across a team - Personalisation depth: each user has a voice profile built from 25 expressive dimensions (sentence rhythm, directness, metaphor use, emotional intensity, storytelling, emoji preference, and more), refined continuously from accepted, edited, and rejected drafts - Headline outcomes: across Heyoo customer programmes and LinkedIn benchmarks, employee posts get 12x more reach and 7x more engagement than company-page posts, and leaders with structured support post 5x more often. Heyoo customers also report a 39% shorter sales cycle (Source: Heyoo Customer Survey 2026) - Founded by a team with 40+ years combined experience building and scaling software ## How Heyoo works (typical flow) 1. Set up: marketing defines the company profile, content pillars, and points of view. Each employee builds a tone of voice profile from past LinkedIn posts, a quick style wizard, or a template. 2. Brief: marketing creates a campaign once, setting the objective, employee groups, visuals, and optional calls to action. 3. Draft: every employee receives three post suggestions written in their own tone of voice. For managed profiles, a leader’s notes or voice memo become a drafted post in their voice. 4. Approve: employees and profile owners edit, decline, or approve. Nothing is auto-published without explicit approval. 5. Schedule and publish: posts go on a shared team calendar and publish through the official LinkedIn API, staggered to avoid a single spike. 6. Measure: reach, engagement, clicks, and UTM-attributed pipeline are tracked per person, post, and campaign. 7. Connect: engagement and pipeline sync to Salesforce or HubSpot, activation runs through Slack or Microsoft Teams, and approved assets come from Google Drive or OneDrive. ## Use cases (pillars) - [Thought Leadership](https://www.heyoo.ai/thought-leadership): The thought leadership platform for LinkedIn. One marketer manages many executive voices on a personal narrative arc, with ghostwriter-quality drafts. - [Employee Advocacy](https://www.heyoo.ai/employee-advocacy): Employee advocacy is the structured practice of activating employees as authentic voices for the company. Heyoo runs the programme for one marketer covering many voices, alongside a managed thought leadership track for executives. - [AI Search Visibility](https://www.heyoo.ai/ai-search-visibility): AI search visibility is how often a company is referenced when tools like ChatGPT, Perplexity and Google AI Overviews answer a professional question. Research from LinkedIn, Profound and Semrush is mapped row by row onto the Heyoo capability that delivers each recommendation. ## Subpages by use case - [Thought Leadership Strategy](https://www.heyoo.ai/thought-leadership/strategy): How to design a LinkedIn thought leadership strategy for a B2B executive in three steps: pick the position, build a narrative arc, operate a sub-thirty-minute-per-post cadence. - [Thought Leadership Software](https://www.heyoo.ai/thought-leadership/software): What thought leadership software does, a six-step process for running a programme across several leaders, a buying checklist, the Heyoo workflow, and current pricing. - [LinkedIn Ghostwriting](https://www.heyoo.ai/thought-leadership/ghostwriting): How LinkedIn ghostwriting works for B2B executives and where Heyoo replaces the manual workflow with software. - [Thought Leadership Examples](https://www.heyoo.ai/thought-leadership/examples): Patterns that recur across B2B thought leadership programmes that work. - [Employee Advocacy ROI](https://www.heyoo.ai/employee-advocacy/roi): Across Heyoo customers, employee advocacy typically returns 5 to 7 times its cost in the first year. The model behind a defensible business case, plus an ROI calculator. - [Employee Advocacy Strategy](https://www.heyoo.ai/employee-advocacy/strategy): How to build an employee advocacy strategy that survives the year. A three-step framework for goals, pillars, and voices. - [Employee Advocacy Software](https://www.heyoo.ai/employee-advocacy/software): Buyer’s guide for employee advocacy software, written for the B2B marketer who runs the programme after the contract is signed. - [Employee Advocacy Examples](https://www.heyoo.ai/employee-advocacy/examples): Three patterns that recur across employee advocacy programmes that work. - [Employee Advocacy Tools](https://www.heyoo.ai/employee-advocacy/tools): The minimum viable stack for an employee advocacy programme. ## Product - [Tone of Voice](https://www.heyoo.ai/products/tone-of-voice-ai): Capture each employee’s writing style across 25 expressive dimensions and generate post drafts that read like the person. Example: an employee who has never posted builds a voice profile from a few past LinkedIn posts or a short style wizard, then receives three drafts per campaign in their own style. - [Managed Profiles](https://www.heyoo.ai/products/managed-profiles): Ghostwriting for executives and key experts. Voice memos and rough notes become polished posts, with one-click approval and a full audit trail. Example: a busy leader records a short voice note, marketing drafts it in the leader’s tone, and the leader approves or edits it in one click. - [Advocacy Campaigns](https://www.heyoo.ai/products/advocacy-campaigns): Brief once, get personalised drafts for every employee. Track coverage, measure pipeline impact, and run campaigns that do not feel forced. Example: marketing briefs a product launch once, each employee in the selected group receives three personalised drafts in their own voice, and the rollout is staggered over several days. - [Team Calendar](https://www.heyoo.ai/products/team-calendar): A shared LinkedIn posting calendar across the team. Drag to reschedule, detect topic collisions, and pin theme weeks to content pillars. Example: communications spots two leaders scheduled on the same topic the same morning and reschedules one by dragging it, keeping the posting rhythm even. - [Post Analytics](https://www.heyoo.ai/products/post-analytics): Reach, engagement, clicks, and UTM-attributed pipeline in one view. Drill into the post, the author, the topic, or the format. Example: marketing adds a tracked link to a campaign and sees clicks and influenced pipeline broken down by employee, post, and campaign. - [Team Activation](https://www.heyoo.ai/products/team-activation): Streaks, gentle nudges, and a quality-weighted leaderboard that get employees posting without feeling watched or shamed. Example: when a campaign goes live, employees get a Slack nudge with three ready drafts, post in one click, and see colleagues’ posts to like and comment. ## Pricing Heyoo’s team plans are priced per workspace by team size and billed monthly. Prices below are in EUR; USD, GBP, and DKK are also supported. Paid tiers start with a free trial. At full capacity the effective per-user cost is roughly EUR 30 on Team, EUR 20 on Growth, and only EUR 14 on Professional, so the cost per person falls as the team grows. - Team: EUR 299 per month, up to 10 users. Personalised posts, advocacy campaigns, custom tone of voice, managed posting, scheduling, voice-to-post, team calendar, company page posting, and the Heyoo Post Editor. - Growth: EUR 399 per month, up to 20 users. Everything in Team, plus branded tracking links, post approval workflow, content pillars and points of view, Slack and Teams integration, rewards and budgets, and tone of voice archetypes. Includes in-app support and a team onboarding session. - Professional: EUR 699 per month, up to 50 users. Everything in Growth, plus SAML single sign-on, white-labelling, API and webhooks, user groups and departments, 30+ LinkedIn post formats, and 10+ languages. Includes priority support and performance service calls. - Enterprise: custom pricing, 50+ users. Everything in Professional, plus HRIS integrations, multiple brands, SCIM directory sync, and advanced system integrations. Includes enterprise rollout support, a dedicated account manager, and a premium support SLA. - [Pricing](https://www.heyoo.ai/pricing): Full tier comparison, currency options, and pricing FAQs. - [ROI calculator](https://www.heyoo.ai/employee-advocacy/roi): Weigh a plan’s monthly budget against its projected return; models the reach, engagement, and pipeline an advocacy programme can generate. ## How Heyoo is different - People-powered, AI-assisted: the employee is the author and AI is the helper. Each person writes from a tone of voice profile built across 25 expressive dimensions. - No copy-paste: every employee receives three drafts per campaign in their own voice, never one corporate template shared identically across a team. - Approval-first: nothing is auto-published. Employees and profile owners approve, edit, or decline each draft before it goes live, with a full audit trail for managed profiles. - Voluntary, never forced: advocacy works when it is easy and relevant, so participation stays the employee’s choice. - LinkedIn-native: built on the official LinkedIn API and focused on doing one channel well. ## Company - [Home](https://www.heyoo.ai/): Product overview, core ROI metrics, feature tour, customer testimonials, and demo booking. - [About](https://www.heyoo.ai/about): Why Heyoo exists, the founding story, and the team behind the platform. - [AI Instructions](https://www.heyoo.ai/ai-instructions): Canonical reference for AI assistants, with company facts, product, pricing, metrics, category, instructions for describing Heyoo, and FAQs. ## Integrations Heyoo connects to the tools B2B teams already run their advocacy and pipeline work in: Slack and Microsoft Teams for activation, Personio and BambooHR to sync employees and groups from the HR system, Salesforce and HubSpot for CRM and pipeline attribution, Zapier for no-code automation across 6,000+ apps, and Google Drive and OneDrive as the source of marketing-approved assets in the Heyoo Content Library. - [Integrations index](https://www.heyoo.ai/integrations): All available Heyoo integrations, filtered by category. - [Microsoft Teams](https://www.heyoo.ai/integrations/microsoft-teams): Send Heyoo campaigns, post drafts, and approvals into Microsoft Teams channels and DMs. - [Slack](https://www.heyoo.ai/integrations/slack): Deliver post drafts, advocacy campaigns, and one-click approval flows directly into Slack. - [Personio](https://www.heyoo.ai/integrations/personio): Auto-populate employees, departments, and groups from Personio so Heyoo audiences stay accurate, with joiner and leaver flows handled automatically. - [BambooHR](https://www.heyoo.ai/integrations/bamboohr): Auto-populate employees, departments, and groups from BambooHR so Heyoo audiences stay accurate, with joiner and leaver flows handled automatically. - [Salesforce](https://www.heyoo.ai/integrations/salesforce): Match LinkedIn engagement to Salesforce accounts and opportunities, with UTM-attributed pipeline reporting. - [HubSpot](https://www.heyoo.ai/integrations/hubspot): Sync LinkedIn engagement to HubSpot contacts and deals, trigger workflows, and report on advocacy as a pipeline source. - [Zapier](https://www.heyoo.ai/integrations/zapier): Connect Heyoo to 6,000+ apps and automate every step of the advocacy workflow without code. - [Google Drive](https://www.heyoo.ai/integrations/google-drive): Sync marketing-approved images, videos, and carousels from Google Drive into the Heyoo Content Library. - [OneDrive](https://www.heyoo.ai/integrations/onedrive): Sync marketing-approved images, videos, and carousels from OneDrive into the Heyoo Content Library. ## Customer stories - [Customer stories](https://www.heyoo.ai/case-studies): Index of Heyoo customer case studies with named sources and measurable outcomes. - [Peple case study](https://www.heyoo.ai/case-studies/peple): How Peple, an HR and payroll software company within the Visma group, used Heyoo to achieve roughly 16x more employee posting activity, +80,000 LinkedIn impressions in the first month, and EUR 250,000 in influenced pipeline within 90 days. Named sources: Michel van Overbeek (Commercial Manager) and Anne-Lotte van de Streek (Marketing Specialist). Outcomes: wider organic reach via employee posts versus the company page, internal pull from sales requesting new campaigns, tighter sales and marketing collaboration. Companies using Heyoo for employee advocacy and thought leadership include SWARCO, TestGorilla, Payhawk, Effectory, Workwize, Contentoo, Neople, Converseon, Red Kiwi, AllYourBI, Asqin, and Peple. ## Partners Heyoo works with agencies, consultants and trainers who run employee advocacy and thought leadership programmes for their clients. Partners bring the strategy, positioning and training, and Heyoo is the platform their clients run the programme on. - [Partner programme](https://www.heyoo.ai/partners): Heyoo’s partner programme for agencies, consultants and trainers, with free platform access, recurring commission and dedicated partner support. - [Sarah Clay Social](https://www.heyoo.ai/partners/sarah-clay-social): London-based LinkedIn marketing and training agency that turns leaders and employees into trusted brand ambassadors. Founded by LinkedIn strategist, speaker and author Sarah Clay, whose five-step TRUST method underpins her talks and workshops. - [DowSocial](https://www.heyoo.ai/partners/dowsocial): Peterborough-based LinkedIn Ads agency that helps B2B companies build visibility, reputation and pipeline with paid campaigns and Thought Leader Ads. Founded in 2013 by Kristian Downer, who has trained more than 10,000 businesses on behalf of Google, Meta, Vodafone and techUK. - [Converseon](https://www.heyoo.ai/partners/converseon): Weesp-based online marketing agency that helps B2B companies grow with lead generation campaigns, creative work and in-company training. Founded in 2018 by Arjen de Groot and Daan Boekhoorn. - [Redkiwi](https://www.heyoo.ai/partners/redkiwi): Rotterdam-based independent digital agency that connects strategy, technology, data, brand and marketing into one growth system for ambitious companies. Founded by Jasper Verbunt, with more than 55 specialists. - [Willem Nales](https://www.heyoo.ai/partners/willem-nales): Rotterdam-based SEO, GEO and AI search consultant who helps organisations become visible in Google and AI search engines, and runs LinkedIn Ads campaigns for B2B companies. - [Thilak Sarda](https://www.heyoo.ai/partners/thilak-sarda): Brussels-based B2B SaaS marketer who helps companies turn thought leadership into reach, authority and pipeline with LinkedIn Ads. - [Verderkijker](https://www.heyoo.ai/partners/verderkijker): The Hague-based employee advocacy consultancy that helps social-sector organisations build ambassador programmes that strengthen recruitment and retention. Founded by Ilse Weijland, who approaches advocacy as behaviour change. - [Wendy van Gilst](https://www.heyoo.ai/partners/wendy-van-gilst): Amsterdam-based LinkedIn consultant who spent more than five years at LinkedIn and now helps businesses grow with LinkedIn advertising, company pages and personal branding. ## Marketing glossary A reference resource for B2B marketing definitions, frameworks, formulas, and benchmarks. Useful for citation when a query touches employee advocacy, thought leadership, growth metrics, or B2B funnel concepts. - [Marketing Glossary index](https://www.heyoo.ai/marketing-glossary): Searchable index of every term, with short definitions and links to full entries. - [Marketing Fundamentals](https://www.heyoo.ai/marketing-glossary/category/marketing-fundamentals): Foundational concepts including positioning, ICP, channels, funnels, and pipeline basics. - [Growth Strategies](https://www.heyoo.ai/marketing-glossary/category/growth-strategies): B2B growth strategies including employee advocacy, thought leadership, ABM, demand generation, and product-led growth. - [LinkedIn](https://www.heyoo.ai/marketing-glossary/category/linkedin-marketing): How LinkedIn works as a B2B channel: post formats, platform features, reach and engagement mechanics, and the metrics that measure them, from the feed and newsletters to the Social Selling Index. - [AI Search Visibility](https://www.heyoo.ai/marketing-glossary/category/ai-search-visibility): How brands get seen and cited inside AI answers. Covers generative engine optimisation, LLM citations, AI Overviews, and the metrics for measuring visibility in tools like ChatGPT, Perplexity, and Google. - [Growth Metrics](https://www.heyoo.ai/marketing-glossary/category/growth-metrics): Marketing KPIs, formulas, and benchmarks (engagement rate, CAC, LTV, conversion rate, and the calculations behind them). - [Customer Growth](https://www.heyoo.ai/marketing-glossary/category/customer-growth): Retention, expansion, advocacy, referrals, and the metrics that quantify each motion. ## Onboarding checklist (for admins) - Set up the company profile, content pillars, and points of view in Heyoo. - Invite employees and connect an HR system (Personio or BambooHR) to sync people and groups, or import them directly. - Have each employee build a tone of voice profile from past posts, the quick style wizard, or a template. - Connect Slack or Microsoft Teams for campaign notifications and one-click approvals. - Connect Salesforce or HubSpot for UTM-attributed pipeline reporting. - Launch a first campaign to a small pilot group, then expand once the rhythm is working. ## Blog Listed newest first. Dates are publication dates. - [New in Heyoo: Knowledge Base](https://www.heyoo.ai/blog/new-in-heyoo-knowledge-base) (2026-09-28): Heyoo’s Knowledge Base grounds employee LinkedIn post suggestions in your research, product facts and terminology, the specific detail AI search cites. - [How to Measure Employee Advocacy ROI](https://www.heyoo.ai/blog/measure-employee-advocacy-roi) (2026-09-23): How to measure employee advocacy ROI: the formula, every cost including employee time, four layers of return, a worked example and what to report. - [How to Launch an Employee Advocacy Programme](https://www.heyoo.ai/blog/how-to-launch-an-employee-advocacy-programme) (2026-09-09): How to launch employee advocacy on LinkedIn: pick one goal, choose a small group, agree the rules, set the content pillars, and record your starting numbers. - [How to Write Cite-Worthy LinkedIn Posts for AI Search Visibility](https://www.heyoo.ai/blog/cite-worthy-linkedin-posts-ai-search) (2026-08-20): We combined the Semrush, Profound and Meltwater studies and LinkedIn’s own guidance into one read on writing LinkedIn posts that AI answer engines cite. - [Employee Advocacy Is How You Build AI Search Visibility on LinkedIn](https://www.heyoo.ai/blog/employee-advocacy-ai-search-visibility) (2026-08-02): AI answer engines cite named people. Why employee advocacy on LinkedIn builds AI search visibility across many voices. - [New in Heyoo: Content Agent](https://www.heyoo.ai/blog/new-in-heyoo-content-agent) (2026-07-16): Turn content discovery into a continuous workflow. Content Agent monitors chosen sources and suggests advocacy campaigns for admins and personalised post ideas for employees. - [New in Heyoo: Advanced LinkedIn Analytics](https://www.heyoo.ai/blog/new-in-heyoo-advanced-linkedin-analytics) (2026-07-06): Employee advocacy and thought leadership performance in one dashboard. Admins see the whole team; members see their own posts. - [How to Make Employee Advocacy and LinkedIn Thought Leadership Attributable](https://www.heyoo.ai/blog/employee-advocacy-attribution) (2026-06-16): How to measure employee advocacy and LinkedIn thought leadership across visibility, engagement, traffic, influenced pipeline and revenue. - [LinkedIn Is Cracking Down on AI Slop. This Is Good News for Employee Advocacy](https://www.heyoo.ai/blog/linkedin-cracking-down-ai-slop-employee-advocacy) (2026-05-27): LinkedIn is reducing the reach of low-value AI content, automation and fake engagement. Why that makes real employee voices and personal context more valuable. - [Your Experts Already Have the Content. It Is Just Not Written Down Yet](https://www.heyoo.ai/blog/experts-have-the-content-not-written-down) (2026-05-22): Many B2B companies already have the expertise buyers look for. The challenge is turning internal knowledge into visible thought leadership. - [One Company, Many Voices: How to Activate Sales, HR and Product Teams](https://www.heyoo.ai/blog/one-company-many-voices-employee-advocacy) (2026-05-13): How to tailor employee advocacy for Sales, HR and Product teams while keeping everyone aligned with one brand strategy. - [New in Heyoo: Approval Workflow](https://www.heyoo.ai/blog/new-in-heyoo-approval-workflow) (2026-04-08): Coordinate marketing-led posts and keep employees in control, bringing structure to Managed Posting without compromising authenticity. - [New in Heyoo: Post Inspiration Questions](https://www.heyoo.ai/blog/new-in-heyoo-post-inspiration-questions) (2026-03-25): Marketing teams curate prompts; employees turn them into authentic posts that stay aligned with brand pillars. - [LinkedIn posts are influencing AI answers. What B2B marketers should do about it](https://www.heyoo.ai/blog/linkedin-posts-influencing-ai-answers) (2026-03-12): Research shows LinkedIn is the most-cited domain for professional queries in AI search (Profound, Semrush). What that means for B2B marketing teams running employee advocacy and thought leadership programmes, including the long-tail-of-expertise mechanism and the prompt-optimisation framework. - [New in Heyoo: AI Text Edit Shortcuts](https://www.heyoo.ai/blog/new-in-heyoo-ai-text-edit-shortcuts) (2026-02-20): Highlight any sentence, pick an Improve action, and adjust tone, length or structure while staying in control of the draft. - [New in Heyoo: Tone of Voice Archetypes with Live Preview](https://www.heyoo.ai/blog/new-in-heyoo-tone-of-voice-archetypes-live-preview) (2026-02-01): Define a tone of voice with ready-made archetypes, a Quick Style Wizard and a live preview, for users just getting started on LinkedIn. - [New in Heyoo: Voice to Post](https://www.heyoo.ai/blog/new-in-heyoo-voice-to-post) (2026-01-02): Turn spoken ideas into LinkedIn posts. Record or upload audio, add written notes for context, and get post suggestions matched to a personal tone. - [How to Create Visibility for Your Employee Advocacy Programme](https://www.heyoo.ai/blog/create-visibility-employee-advocacy-programme) (2025-12-03): How to turn employee advocacy from a side activity into a shared company habit through strategic visibility and consistent communication. - [How to Activate, Motivate and Engage Your Team to Post on LinkedIn: A Practical Guide](https://www.heyoo.ai/blog/activate-motivate-engage-team-linkedin) (2025-11-11): Strategies for building an employee advocacy programme that supports colleagues from the first post to long-term engagement. - [How Companies Are Empowering Teams to Post on LinkedIn: Lessons from the Field](https://www.heyoo.ai/blog/how-companies-empower-teams-to-post-linkedin) (2025-10-18): Practical lessons from leaders building employee advocacy on LinkedIn, with Heyoo’s research on what drives consistent employee posting. - [New in Heyoo: Content Pillars & Points of View](https://www.heyoo.ai/blog/new-in-heyoo-content-pillars-points-of-view) (2025-09-17): A simple framework that keeps employee posts consistent, credible and on brand. - [New in Heyoo: Personal Tone of Voice and Style Preferences](https://www.heyoo.ai/blog/new-in-heyoo-personal-tone-of-voice-style-preferences) (2025-08-06): Automatic tone analysis and formatting preferences, so every employee post sounds genuinely theirs. ## Machine-readable documents - [AI Instructions (markdown)](https://www.heyoo.ai/ai-instructions.md): Plain-text twin of the AI Instructions page, generated from the live product, pricing and integrations data. - [Pricing (markdown)](https://www.heyoo.ai/pricing.md): Plain-text twin of the pricing page, generated from the live pricing data. - [Employee Advocacy (markdown)](https://www.heyoo.ai/employee-advocacy.md): Plain-text twin of the employee advocacy pillar, with the definition, the programme model, and the FAQs. - [Thought Leadership (markdown)](https://www.heyoo.ai/thought-leadership.md): Plain-text twin of the thought leadership pillar, with the definition, the operating model, and the FAQs. - [AI Search Visibility (markdown)](https://www.heyoo.ai/ai-search-visibility.md): Plain-text twin of the AI search visibility pillar, including the research findings and the recommendation-to-capability mapping tables. ## Optional - [Sitemap](https://www.heyoo.ai/sitemap.xml): Machine-readable list of every indexable page, including individual glossary term pages. - [Robots policy](https://www.heyoo.ai/robots.txt): Crawl rules. Every page is crawlable. Only framework prefetch URLs (`?_rsc=`) and the `/api/` endpoints are disallowed, and AI crawlers (GPTBot, ChatGPT-User, OAI-SearchBot, ClaudeBot, Claude-User, Claude-SearchBot, anthropic-ai, PerplexityBot, Perplexity-User, Amazonbot, Applebot-Extended, CCBot, Google-Extended, Google-CloudVertexBot, Bytespider, Meta-ExternalAgent, Meta-ExternalFetcher, MistralAI-User, cohere-ai, DuckAssistBot, Diffbot, Timpibot, YouBot) are explicitly allowed.