---
title: "Optional section: glossary: Agent Ready HTML"
description: "Optional section defined: An H2 named Optional in llms.txt that holds secondary links. v2 keeps it as a convention and drops its special meaning for tools."
canonical: https://agentreadyhtml.com/glossary/optional-section/
site: "Agent Ready HTML"
last_updated: 2026-11-04
section: "Glossary"
---

# Optional section: glossary: Agent Ready HTML

> Optional section defined: An H2 named Optional in llms.txt that holds secondary links. v2 keeps it as a convention and drops its special meaning for tools.

Source: https://agentreadyhtml.com/glossary/optional-section/
Site: Agent Ready HTML
Last reviewed: 2026-11-04

# 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](https://llmstxt.org/changes.html), read 4 November 2026.

## Where it shows up on this site

-   [llms.txt reference](https://agentreadyhtml.com/llms-txt/)

## Neighbouring terms

-   [File list](https://agentreadyhtml.com/glossary/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](https://agentreadyhtml.com/glossary/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](https://agentreadyhtml.com/glossary/llms-txt/): A markdown file at /llms.txt that names a site, summarises it and lists links to LLM-friendly pages.
-   [Subpath llms.txt](https://agentreadyhtml.com/glossary/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](https://agentreadyhtml.com/glossary/plain-fetch/): An HTTP GET that reads the response body without executing scripts, the way most agent web tools and curl read pages.

## Sources

1.  [llmstxt.org](https://llmstxt.org/changes.html) https://llmstxt.org/changes.html, read 4 November 2026

Last reviewed 4 November 2026

Edition

Crawl

2026-11-04

Page updated

2026-11-04

Method

How the viewer reads a page, how a file is graded and how a platform is scored: [the method page](https://agentreadyhtml.com/method/).