diff --git a/src/CampaignAdmin.php b/src/CampaignAdmin.php
index 6d49fb5..9059580 100644
--- a/src/CampaignAdmin.php
+++ b/src/CampaignAdmin.php
@@ -61,6 +61,9 @@ class CampaignAdmin extends LeftAndMain implements PermissionProvider
 
     private static $menu_icon_class = 'font-icon-page-multiple';
 
+    /**
+     * @deprecated 5.4.0 Will be renamed to model_class
+     */
     private static $tree_class = ChangeSet::class;
 
     /**