Technical · May 22, 2026 · 7 min read
What is llms.txt, and should you add one?
llms.txt is a proposed standard: a simple Markdown file at the root of your site that points AI models to your most important, cleanly formatted content. Think of it as a curated map for large language models, in the same spirit that robots.txt and sitemap.xml serve crawlers. It is low effort to add, and while adoption by engines is still evolving, it is a reasonable, low-risk part of a complete AEO setup. Here is what it is and whether to bother.
What llms.txt actually is
llms.txt lives at your domain root (for example, yoursite.com/llms.txt). It is written in Markdown, so it is readable by both people and models, and it typically contains:
- A short description of your site and what it is about.
- Curated links to your most important pages, often with a one-line summary of each.
- Optionally, links to clean, Markdown versions of key pages for easy ingestion.
The goal is to give a model a concise, high-signal guide to your best content, rather than making it infer everything by crawling.
How it differs from robots.txt and sitemap.xml
- robots.txt tells crawlers what they may and may not access.
- sitemap.xml lists your URLs so search engines can discover them.
- llms.txt curates and summarizes your best content specifically for language models, with context, not just a list of links.
They are complementary. llms.txt does not replace the other two; it adds a model-friendly layer on top.
Does it actually work?
Here is the honest picture. llms.txt is a community proposal, not an official requirement, and support from the major engines is still inconsistent and evolving. You should not expect adding it to produce citations on its own. What it does offer:
- Low cost, low risk. It takes very little time to create and cannot hurt you.
- Clarity. It forces you to identify your best, most citable pages, which is a useful exercise regardless.
- Optionality. If and as engines lean on it more, you are already set up.
In other words, treat it as a sensible hygiene step, not a growth lever.
How to create one
- List your most important pages: your core product pages, your best guides, your comparison and definition pages.
- Write a one or two sentence description of your site and what it covers.
- For each key page, add a link and a short summary of what it answers.
- Save it as Markdown at yoursite.com/llms.txt.
- Keep it current as you publish new cornerstone content.
Where it fits in your AEO program
llms.txt is a small piece of a much larger picture. The things that actually move citations, answer-first content, a strong entity, corroboration, crawlability, and freshness, matter far more. Add llms.txt as part of your technical foundation, then spend your real effort on content and entity work. See the AEO checklist for the full set, and schema markup for AEO for the other key technical layer.
The bottom line
Should you add llms.txt? Yes, if you have a spare hour, because it is cheap, harmless, and forward-looking. Should you expect it to transform your AI visibility? No. It is a nice-to-have that complements the work that really counts.
How Revlift can help
We handle the technical foundations, llms.txt, schema, crawlability, alongside the content and entity work that actually drives citations. Revlift gets your brand cited across ChatGPT, Perplexity, Gemini, and Google AI, and proves it with a live dashboard you can watch. Start with a $500 AI Visibility Audit (founding-client pricing, normally $1,500): a full read on where you stand and a 90-day plan to get cited.