diff --git a/site/content/3.12/release-notes/version-3.12/incompatible-changes-in-3-12.md b/site/content/3.12/release-notes/version-3.12/incompatible-changes-in-3-12.md
index 696a7d8fc2..bd335d09db 100644
--- a/site/content/3.12/release-notes/version-3.12/incompatible-changes-in-3-12.md
+++ b/site/content/3.12/release-notes/version-3.12/incompatible-changes-in-3-12.md
@@ -900,6 +900,15 @@ the following steps.
 4. Restore the dump to the new deployment. You can directly move from any
    3.11 or 3.12 version to 3.12.4 (or later) this way.
 
+### Added error reporting for invalid requests
+
+<small>Introduced in: v3.12.6</small>
+
+When _arangod_ parses HTTP requests and encounters an unexpected `Content-Length`
+header or an invalid URL, it now sends a response with an error object instead
+of closing the connection, e.g. that the URL is corrupt with an HTTP status code
+of 400.
+
 ## HTTP RESTful API
 
 ### JavaScript-based traversal using `/_api/traversal` removed
diff --git a/site/content/3.13/release-notes/version-3.12/incompatible-changes-in-3-12.md b/site/content/3.13/release-notes/version-3.12/incompatible-changes-in-3-12.md
index 696a7d8fc2..bd335d09db 100644
--- a/site/content/3.13/release-notes/version-3.12/incompatible-changes-in-3-12.md
+++ b/site/content/3.13/release-notes/version-3.12/incompatible-changes-in-3-12.md
@@ -900,6 +900,15 @@ the following steps.
 4. Restore the dump to the new deployment. You can directly move from any
    3.11 or 3.12 version to 3.12.4 (or later) this way.
 
+### Added error reporting for invalid requests
+
+<small>Introduced in: v3.12.6</small>
+
+When _arangod_ parses HTTP requests and encounters an unexpected `Content-Length`
+header or an invalid URL, it now sends a response with an error object instead
+of closing the connection, e.g. that the URL is corrupt with an HTTP status code
+of 400.
+
 ## HTTP RESTful API
 
 ### JavaScript-based traversal using `/_api/traversal` removed