diff --git a/config/initializers/extends.rb b/config/initializers/extends.rb
index 3d0fb3d0d..3dce3347e 100644
--- a/config/initializers/extends.rb
+++ b/config/initializers/extends.rb
@@ -12,9 +12,10 @@ class Extends
 
   # Extends enum types. Should not be freezed, as modules might append to this.
   # !!!Check all addons for the correct order!!!
+  # DEPRECATED 'system_message' in (SCI-2952, kept b/c of integer enums)
   NOTIFICATIONS_TYPES = { assignment: 0,
                           recent_changes: 1,
-                          system_message: 2,
+                          system_message: 2, # DEPRECATED
                           deliver: 5 }
 
   TASKS_STATES = { uncompleted: 0,