diff --git a/fern/products/docs/pages/ai/llms-txt/analytics-integration.mdx b/fern/products/docs/pages/ai/llms-txt/analytics-integration.mdx
index 63ed9381a6..71a6b652f2 100644
--- a/fern/products/docs/pages/ai/llms-txt/analytics-integration.mdx
+++ b/fern/products/docs/pages/ai/llms-txt/analytics-integration.mdx
@@ -17,7 +17,7 @@ To make endpoints discoverable to human readers, add buttons or navigation links
 
 <AccordionGroup>
 <Accordion title="Add a button for SDK docs">
-Add a button to your SDK docs that links to `llms.txt` for your API Reference. Use `lang` to filter code examples to one language, and `excludeSpec=true` to exclude the raw OpenAPI specification.
+Add a button to your SDK docs that links to `llms.txt` for your API Reference. Use `lang` to filter code examples to one language, `excludeSpec=true` to exclude the raw OpenAPI specification, and `excludeChangelog=true` to exclude changelog sections.
 
 ```jsx Markdown
 <Button href="/api-reference/llms.txt?lang=python&excludeSpec=true" target="_blank">
diff --git a/fern/products/docs/pages/ai/llms-txt/customize-llms-txt.mdx b/fern/products/docs/pages/ai/llms-txt/customize-llms-txt.mdx
index d398ede688..29740845d0 100644
--- a/fern/products/docs/pages/ai/llms-txt/customize-llms-txt.mdx
+++ b/fern/products/docs/pages/ai/llms-txt/customize-llms-txt.mdx
@@ -86,12 +86,13 @@ To debug what AI sees for any page, append `.md` or `.mdx` to the page URL to [v
 
 ## Filter endpoint output
 
-Filter `llms.txt` output with the `lang` and `excludeSpec` query parameters to reduce token usage. Parameters can also be combined.
+Filter `llms.txt` output with the `lang`, `excludeSpec`, and `excludeChangelog` query parameters to reduce token usage. Parameters can also be combined.
 
 ```txt Example
 /llms.txt?lang=python
 /llms.txt?excludeSpec=true
-/llms.txt?lang=python&excludeSpec=true
+/llms.txt?excludeChangelog=true
+/llms.txt?lang=python&excludeSpec=true&excludeChangelog=true
 ```
 
 <ParamField path="lang" type="'node' | 'python' | 'java' | 'ruby' | 'go' | 'csharp' | 'swift'">
@@ -102,6 +103,10 @@ Filter `llms.txt` output with the `lang` and `excludeSpec` query parameters to r
   Exclude OpenAPI and AsyncAPI specification sections.
 </ParamField>
 
+<ParamField path="excludeChangelog" type="boolean">
+  Exclude changelog sections, including the nested changelog `llms.txt` index. Useful for sites with long release histories, where changelog entries can dominate the index.
+</ParamField>
+
 ## Exclude whole pages
 
 You can exclude whole pages from LLM endpoints (`llms.txt`) by [adding `noindex: true`](/learn/docs/seo/setting-seo-metadata#noindex) to the page's frontmatter. Pages marked `noindex` aren't indexed by search engines but remain visible in your sidebar navigation and can still be accessed directly by URL. To also hide a page from navigation, see [Hiding content](/learn/docs/customization/hiding-content).
diff --git a/fern/products/docs/pages/changelog/2026-09-18.mdx b/fern/products/docs/pages/changelog/2026-09-18.mdx
new file mode 100644
index 0000000000..0aaa6e1aca
--- /dev/null
+++ b/fern/products/docs/pages/changelog/2026-09-18.mdx
@@ -0,0 +1,7 @@
+## Exclude changelogs from llms.txt
+
+<ChangelogTags>ai</ChangelogTags>
+
+You can now omit changelog sections from `llms.txt` by adding the `excludeChangelog=true` query parameter. This keeps the index small for sites with long release histories. It combines with the existing `lang` and `excludeSpec` parameters, for example `/llms.txt?lang=python&excludeSpec=true&excludeChangelog=true`.
+
+<Button intent="none" outlined rightIcon="arrow-right" href="/learn/docs/ai-features/customize-llms-txt#filter-endpoint-output">Read the docs</Button>