The llms.txt file is becoming as important for AI search as robots.txt is for traditional search. Here's everything you need to know.
What is llms.txt?
llms.txt is a plain text file placed at your website's root (e.g., yoursite.com/llms.txt) that provides a machine-readable description of your site for Large Language Models. Think of it as a cover letter for AI crawlers.
Why llms.txt Matters
Research by Otterly.AI found that sites with llms.txt files see measurably higher AI citation rates. The file helps AI engines:
Understand your business and its offerings
Know which content to prioritize
Identify your site's authority areas
Find your key pages and resources
What to Include in llms.txt
A good llms.txt file should contain:
```
Your Company Name
> A one-line description of what you do.
What We Do
A 2-3 sentence explanation of your business, products, or services.
Key Pages
Homepage: https://yoursite.com
Products: https://yoursite.com/products
Blog: https://yoursite.com/blog
About: https://yoursite.com/about
Pricing
Brief pricing information if applicable.
Contact
How to reach you. ```
How to Check Your llms.txt
Direct URL check: Visit yoursite.com/llms.txt in your browser
Automated audit: Use SiteCrawlIQ's GEO audit, which checks for llms.txt presence, format, and completeness
AI crawler simulation: Check if your robots.txt allows AI crawlers to reach the file
Common llms.txt Mistakes
Too vague: "We help businesses grow" tells AI nothing useful
Too long: Keep it concise - AI engines process the entire file
Missing URLs: Always include direct links to your key pages
Outdated info: Update llms.txt when your pricing or offerings change
Wrong location: Must be at the root domain, not in a subdirectory
Best Practices
Keep it under 500 words
Use markdown formatting for readability
Include your key differentiators
Link to your most important pages
Update it quarterly or when products change
The sites that get cited most by AI engines make it easy for those engines to understand what they do and what content they offer. llms.txt is the simplest, highest-impact step you can take for GEO.
See Your Site's Real SEO Data
Stop guessing and start with real crawl data. SiteCrawlIQ combines traditional SEO auditing with GEO readiness scoring, structured data validation, and Core Web Vitals monitoring. Our hybrid crawler renders JavaScript pages, checks your llms.txt file, validates schema markup, and scores your content for AI engine citability. Get a comprehensive health score across seven weighted categories, plus a prioritized action plan generated by GPT-5 analysis of your actual crawl data.