diff --git a/typo3/sysext/core/Documentation/Changelog/11.0/Breaking-79565-RemovedUsergroup_cached_listDatabaseField.rst b/typo3/sysext/core/Documentation/Changelog/11.0/Breaking-79565-RemovedUsergroup_cached_listDatabaseField.rst
index 51c3ca4ce04aeb14c7c2e31120d020227d8fc56c..0d626dc1d60a965fa64e54bc479513a17f669add 100644
--- a/typo3/sysext/core/Documentation/Changelog/11.0/Breaking-79565-RemovedUsergroup_cached_listDatabaseField.rst
+++ b/typo3/sysext/core/Documentation/Changelog/11.0/Breaking-79565-RemovedUsergroup_cached_listDatabaseField.rst
@@ -24,6 +24,9 @@ Impact
 The mentioned database field is removed, any direct SQL queries
 accessing or writing this field will result in a database error.
 
+The PHP entry is removed from
+:php:`\TYPO3\CMS\Core\Authentication\BackendUserAuthentication->user` array.
+Accessing the array key will result in warnings since PHP 8.0.
 
 Affected Installations
 ======================
@@ -31,10 +34,13 @@ Affected Installations
 TYPO3 installations using or querying this database field
 with third-party extensions.
 
+TYPO3 installations reading the array key from
+:php:`\TYPO3\CMS\Core\Authentication\BackendUserAuthentication->user` array.
 
 Migration
 =========
 
-Use the class :php:`GroupResolver` to fetch all groups of a user directly.
+Use the class :php:`\TYPO3\CMS\Core\Authentication\GroupResolver`
+to fetch all groups of a user directly.
 
 .. index:: Backend, PHP-API, NotScanned, ext:core