diff --git a/Neos.Neos/Classes/Utility/User.php b/Neos.Neos/Classes/Utility/User.php
index 1d7f0840544..9ecaaf1d110 100644
--- a/Neos.Neos/Classes/Utility/User.php
+++ b/Neos.Neos/Classes/Utility/User.php
@@ -6,12 +6,15 @@
 
 /**
  * Utility functions for dealing with users in the Content Repository.
+ *
+ * @deprecated with Neos 9.0 please use the respective replacements instead.
  */
 class User
 {
     /**
      * Constructs a personal workspace name for the user with the given username.
      *
+     * @deprecated with Neos 9.0 please use {@see WorkspaceNameBuilder::fromAccountIdentifier} instead.
      * @param string $username
      * @return string
      */
@@ -23,6 +26,7 @@ public static function getPersonalWorkspaceNameForUsername($username): string
     /**
      * Will reduce the username to ascii alphabet and numbers.
      *
+     * @deprecated with Neos 9.0 please implement your own slug genration. You might also want to look into transliteration with {@see \Behat\Transliterator\Transliterator}.
      * @param string $username
      * @return string
      */