# What is llms.txt?

llms.txt is a plain-text file placed at a website's root that gives AI systems a curated, Markdown-formatted map of the site's most important content, so models can find and parse it without crawling the full HTML.

## How it works

The file lists key pages with short descriptions, in Markdown, in priority order: a deliberate, human-curated guide to what matters on the site. It was proposed by Jeremy Howard of Answer.AI in 2024 as a standard, and support depends on whether a given AI system chooses to read it.

Adoption is still early, which is the opportunity. [In rawmktg's AEC teardown, zero of six companies had published an llms.txt file](/blogs/aec-ai-visibility-gap). Being among the first in a category to ship one is a low-cost signal almost no competitor has matched.

## llms.txt vs robots.txt

robots.txt controls access: which crawlers may visit which paths. llms.txt guides attention: which content a model should prioritise and how to read it. One restricts, the other curates, and they are used together.

## Why it matters for B2B

It is one of the cheapest GEO moves available: a single static file that makes your best content easier for models to locate and parse, in a field where most competitors have not published one.

**Example**

```
# Acme

> Acme builds X for Y teams.

## Key pages
- [What is X](https://acme.com/x): one-line summary
- [Pricing](https://acme.com/pricing): one-line summary
```

A single static file at `/llms.txt`. In our AEC teardown, zero of six competitors had published one.

*Source: https://rawmktg.com/glossary/llms-txt · rawmktg. by Vinayak Ravi*