LLMs.txt
A proposed standard file that helps AI language models understand and cite your website content.
The Definition
LLMs.txt is an emerging standard (similar to robots.txt but for AI) that provides structured information about your website to large language models. It helps AI systems like ChatGPT, Perplexity, and Claude understand your site's content, authority, and preferred citation format when generating AI-powered search results.
Why It Matters
As AI-powered search (Google SGE, Perplexity, ChatGPT) grows, having a well-structured LLMs.txt file helps ensure your content is correctly understood and cited by AI systems. This is a critical part of Answer Engine Optimization (AEO) strategy.
Best Practices
Create a well-structured LLMs.txt file at your domain root that clearly describes your site purpose, authority, and content areas
Include your organization name, description, key content categories, and preferred citation format
Keep the file updated as your content strategy evolves — stale LLMs.txt files provide inaccurate context to AI systems
Complement LLMs.txt with strong schema markup, FAQ content, and clear topical authority signals
Monitor AI-generated search results (Google SGE, Perplexity, ChatGPT) to see if and how your content is being cited
Write content with clear, factual statements that AI systems can confidently attribute and cite
Mistakes to Avoid
- 1
Not having any LLMs.txt file at all, leaving AI systems to guess your site context and authority
- 2
Writing vague or marketing-heavy descriptions instead of clear, factual content summaries
- 3
Assuming traditional SEO alone is sufficient for AI search — AEO requires additional structured signals
- 4
Not monitoring AI search citations to understand how your content appears in AI-generated answers
Audit Checks
How Digispot AI identifies and fixes related issues
Your llms.txt file is too large.
Impact: An oversized file may exceed an AI tool's context limits.
Trim it to the most important links and summary. • Move secondary content to an "Optional" section. • Keep it concise.
Your llms.txt links use vague text like "click here".
Impact: AI tools can't tell what a link is for from generic text.
Use descriptive link text that explains the resource. • Avoid generic phrases. • Re-check the file.
Your llms.txt has no blockquote summary of the site.
Impact: A summary gives AI assistants a quick overview of your site's purpose.
Add a blockquote (>) with a brief site description after the title. • Keep it to a sentence or two. • Re-check the file.
Your site has no llms.txt file to guide AI assistants.
Impact: Without it, AI tools must parse the whole site, often inefficiently.
Add an /llms.txt file with your site name and summary. • List key content sections with markdown links. • Keep it concise.
Some links in your llms.txt are not well-formed markdown links (e.g. bare URLs in list items instead of [name](url)).
Impact: The llms.txt spec expects [name](url) link lists — bare or broken links lose the descriptive name AI tools use to pick relevant resources.
Use proper markdown link format: [title](https://…). • Convert bare-URL list items ("- Name: https://…") into "[Name](https://…)" links. • Re-check the file.
Your llms.txt file is missing its H1 title.
Impact: Without a title, AI assistants may not identify your site correctly.
Add an H1 heading with your site or project name at the top. • Keep it concise and clear. • Re-check the file.