> ## Documentation Index > Fetch the complete documentation index at: https://www.usenotra.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Shelf space > Shelf space lists the third-party pages AI engines cite for your prompts, like review sites, listicles and communities, and tracks whether your brand is on them. When engines recommend products, they rely on a small set of pages: review sites, "best tools" listicles, community threads and news. If those pages list competitors and not you, engines recommend the competitors, so Shelf Space finds those pages and lets your team open a ticket for each one. Shelf Space board with cited third-party pages Shelf Space board with cited third-party pages ## What a shelf is A shelf is a third-party page that engines cited while answering your tracked prompts. Each shelf shows: * The page and its kind, as described in [Page kinds](#page-kinds). * How many answers cited it, which engines cited it and when it was first and last cited. * **Who is on the shelf**: your brand and each tracked competitor, marked **On shelf** or **Missing**. A shelf opened, showing citations and who is on the shelf A shelf opened, showing citations and who is on the shelf New shelves start with placement unknown. When you open the row and mark your brand and each competitor as **On shelf** or **Missing**, the badge changes to **Marked by a teammate**. ## Work a shelf Notra flags pages that list competitors but not you as opportunities. **Open ticket** assigns the page to a teammate with an optional due date. Pitch the editor, submit a review or join the thread, and move the ticket through **Open**, **In progress**, **Won**, **Lost** or **Dismissed**. Once your brand is on the page, mark it **On shelf** so later scans can show whether engines start mentioning you for the prompts that cite it. You can filter the board by tickets assigned to you, unassigned tickets or closed tickets, and shelves without a ticket appear in the **Untracked** column. **Add shelf** tracks a page engines have not cited yet but you want to be on. ## Page kinds Notra sets the kind from the page's domain. | Kind | Domains | | - | - | | Community | Reddit, Hacker News, Quora, Stack Overflow and Stack Exchange, Product Hunt, Indie Hackers | | Video | YouTube, Vimeo | | Review site | G2, Capterra, TrustRadius, Gartner, Trustpilot | | News | TechCrunch, The Verge, Wired | | Docs | Any domain starting with `docs.` | | Listicle | Pages you add by hand default to this kind | | Other | Everything else | This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.