diff --git a/CHANGELOG.md b/CHANGELOG.md
index b54e1c9c..9c7d0eac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,7 +15,7 @@
 
 ### Changed
 
-* `docs/conf.py` [#610](https://github.com/canonical/sphinx-stack/pull/610), [#634](https://github.com/canonical/sphinx-stack/pull/634), [#646](https://github.com/canonical/sphinx-stack/pull/646), [#650](https://github.com/canonical/sphinx-stack/pull/650)
+* `docs/conf.py` [#610](https://github.com/canonical/sphinx-stack/pull/610), [#634](https://github.com/canonical/sphinx-stack/pull/634), [#646](https://github.com/canonical/sphinx-stack/pull/646), [#650](https://github.com/canonical/sphinx-stack/pull/650), [#651](https://github.com/canonical/sphinx-stack/pull/651)
 * `docs/Makefile` [#605](https://github.com/canonical/sphinx-stack/pull/605), [#610](https://github.com/canonical/sphinx-stack/pull/610), [#627](https://github.com/canonical/sphinx-stack/pull/627), [#628](https://github.com/canonical/sphinx-stack/pull/628)
 * `docs/requirements.txt` [#634](https://github.com/canonical/sphinx-stack/pull/634), [#646](https://github.com/canonical/sphinx-stack/pull/646), [#650](https://github.com/canonical/sphinx-stack/pull/650)
 * `docs/_templates/header.html` [#650](https://github.com/canonical/sphinx-stack/pull/650)
diff --git a/docs/conf.py b/docs/conf.py
index 7b021b9c..0082546c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -140,6 +140,9 @@
 # Generate an 'llms-full.txt' file containing all of the documentation content
 llms_txt_full_build = True
 
+# Suppress warnings from upstream markdown builder
+llms_txt_suppress_unknown_node_warnings = True
+
 # The base URL for references built by sphinx-markdown-builder.
 if os.environ.get("READTHEDOCS"):
     markdown_http_base = html_baseurl