diff --git a/features/notify_helpers.py b/features/notify_helpers.py
index f22ed38..5f77307 100644
--- a/features/notify_helpers.py
+++ b/features/notify_helpers.py
@@ -123,6 +123,7 @@
   return notified
 
 
+# TODO: change to FlaskInternalTask when convert to flask
 class NotifyTaskBase(jsonfeed.InternalTask):
   """Abstract base class for notification task handler."""