diff --git a/system/docs/CHANGELOG.md b/system/docs/CHANGELOG.md
index 57cac6104a..cd1f1cc028 100644
--- a/system/docs/CHANGELOG.md
+++ b/system/docs/CHANGELOG.md
@@ -4,6 +4,9 @@ Contao Open Source CMS Changelog
 Version 3.1.3 (2013-XX-XX)
 --------------------------
 
+### Fixed
+Unset the primary key if a model is deleted (see #6162).
+
 ### Fixed
 Support `tel:` and `sms:` upon IDNA conversion (see #6148).