llms.txt is a Markdown file served at the site root that lists the canonical pages, docs, and resources you want AI models to retrieve. Unlike robots.txt (which is about exclusion), llms.txt is an inclusion list — a curated tour an LLM can follow when first encountering your brand.
The file is a simple H1 (the site name), a short description, then grouped bullet links. Most AI retrievers fetch /llms.txt alongside the sitemap. Shopify stores cannot serve arbitrary root files without an app proxy, which is why most merchants host llms.txt on a subdomain or via a dedicated indexing platform.
# Acme Moissanite > Lab-grown moissanite rings, Shopify Plus ## Core pages - [Engagement rings](https://acme.example/collections/engagement): our flagship SKUs - [Care guide](https://acme.example/pages/care): long-form care FAQ