Optional section
In short
An H2 named Optional in llms.txt that holds secondary links. v2 keeps it as a convention and drops its special meaning for tools. Example: The v2 changes page says the mechanical meaning of Optional is gone. Related terms: File list, llms-full.txt, llms.txt, Subpath llms.txt, Plain fetch.
Source of the example
The example in the summary above is from llmstxt.org, read 4 November 2026.
Where it shows up on this site
Neighbouring terms
- File list: An H2 section in llms.txt holding a markdown list of links in the form [name](url), optionally followed by a colon and notes.
- llms-full.txt: A companion file, not defined in the llmstxt.org text, that concatenates the full markdown of a site in one document.
- llms.txt: A markdown file at /llms.txt that names a site, summarises it and lists links to LLM-friendly pages.
- Subpath llms.txt: An llms.txt below the root that covers the pages under its path; v2 says the most specific file applies.
- Plain fetch: An HTTP GET that reads the response body without executing scripts, the way most agent web tools and curl read pages.
Sources
- llmstxt.org https://llmstxt.org/changes.html, read 4 November 2026
Last reviewed 4 November 2026