llms.txt explained — what it is and what to put in yours

If you’ve been reading about AI search optimization, you’ve probably run into the phrase “llms.txt” and wondered if it’s a real standard or a buzzword. It’s real — and worth five minutes of your attention.

What llms.txt actually is

llms.txt is a plain-text file that lives at the root of your website (at /llms.txt) and gives AI crawlers a curated map of the content you most want them to prioritize. Think of it as the AI-search equivalent of robots.txt, but focused on what to read carefully rather than what to avoid.

It isn’t a W3C standard yet. It isn’t mandatory. But it’s been adopted by a growing list of AI crawlers and search systems, and it’s one of the lowest-effort, highest-leverage moves you can make on your site right now.

Why it matters

When an AI search engine answers a question about your business, it has to decide which pages to consult. A model encountering your homepage, 40 blog posts, a contact page, a privacy policy, and a pile of old legacy pages has to guess which ones are most authoritative and representative.

llms.txt lets you answer that question explicitly. You tell the system: these are my five best pages, here’s a one-line description of each, go here first.

What to put in yours

A practical llms.txt starts with:

1. A one-line summary of your business.
2. A short paragraph expanding on that summary.
3. A linked list of your most important pages — services, key guides, pricing, contact — each with a short description.
4. Optional sections for blog content, locations, resources, or anything else you want AI systems to treat as high-signal.
5. Contact info.

Keep it clean. Don’t dump your whole sitemap into it. The value is in curating.

Where to put it

A literal file at yourdomain.com/llms.txt. Served as text/plain or text/markdown. No login, no redirects, no JavaScript. AI crawlers are simple consumers — make it easy.

Common mistakes

• Listing every page you have. Defeats the purpose. Pick your best 8–15.
• Overly salesy copy. AI systems don’t cite brochures. Write it like a concise information page.
• Never updating it. Your services change. Your pricing changes. Refresh it at least once a quarter.
• Blocking AI crawlers in robots.txt while publishing llms.txt. They can’t read the map you made for them.

The bottom line

It’s a small file that does outsized work for AI search visibility. If your site doesn’t have one, put that task at the top of next week’s list.

Want us to write and maintain yours? Start here.