What is llms.txt, and how do you write one?
llms.txt is an emerging standard: a simple markdown file placed at your site root (/llms.txt) that tells AI systems which of your pages are most important and citable. It complements, rather than replaces, robots.txt and your sitemap.
Where does llms.txt go?
At the root of your domain, served as text/markdown — for example, https://example.com/llms.txt. It's a curated map for machines, listing your highest-value pages with short descriptions.
What should it contain?
A short site summary, then linked sections grouping your most citable pages — guides, documentation, and reference content — each with a one-line description so an AI knows what it will find.
Frequently asked questions
It's a low-cost, emerging signal. It won't fix crawlability or thin content, but it helps AI systems find and prioritize your best pages.
No. robots.txt controls crawler access; llms.txt is a positive guide to your most important content for AI systems.