What Is llms.txt and Does Your Site Need One?

What llms.txt is

llms.txt is a simple text file you place at the root of your site, like robots.txt, but written for AI. Instead of controlling crawlers, it gives them a clean, human-written summary of what your business is, what you offer, and which pages matter most.

It is an emerging convention rather than a hard standard, but it is being adopted quickly by sites that want to be understood and cited accurately by AI assistants.

Why it exists

AI models do their best to understand a site by crawling it, but a lot can get lost in navigation, markup, and clutter. llms.txt hands the model a tidy, authoritative summary in plain language, reducing the chance it misunderstands or overlooks you.

What goes in it

Keep it clear and factual. A good llms.txt usually includes:

• A one-line description of the business.
• Contact details and the main site URL.
• A short, linked list of your key pages and what each covers.
• Any proof points or context you want cited accurately.

A short example

# Your Business

> One line on what you do and who you serve.

Contact: [email protected]

## Services
- [Service A](https://example.com/a): what it is.
- [Service B](https://example.com/b): what it is.

Does your site need one

If you care about how AI assistants describe and cite your business, and most companies should, it is a low-effort, high-clarity addition. It will not single-handedly win citations, but it removes friction and ambiguity, which is exactly what helps.

How to add one

Write the file, save it as llms.txt, and place it at your site root so it is reachable at yourdomain.com/llms.txt. Keep it updated as your services and key pages change.

How to write a good one

A weak llms.txt is vague and out of date. A good one is short, factual, and genuinely useful to a model trying to describe you. A few principles keep it effective.

• Lead with one clear line on what you do and who you serve.
• Link your key pages and say plainly what each one covers.
• Include the proof points and context you want cited accurately.
• Do not stuff it with keywords; write it for a careful human reader.
• Keep it current, and pair it with proper schema on the pages themselves.

Think of it as the briefing you would hand a smart new employee on their first day: enough to describe you accurately, nothing padded. That is exactly what an AI model needs, too.

It is worth setting a reminder to revisit the file whenever your services, key pages, or positioning change. An out-of-date llms.txt is worse than none, because it can lead an assistant to describe you inaccurately. Treat it as a small living document: a few minutes each quarter keeps it current, and accuracy is the entire point. Paired with clean schema and genuinely useful pages, it quietly improves how the wider AI ecosystem understands your business.

None of this is heavy lifting. Writing a first llms.txt takes an afternoon, and maintaining it takes minutes. For the small effort involved, the payoff is meaningful: a clearer, more accurate picture of your business in the tools a growing number of your customers now use to decide who to trust. That is a trade worth making before your competitors get to it first. In a landscape where AI increasingly shapes that first impression, a few minutes spent making sure the machines describe you correctly is time very well spent.