diff --git a/frontends/src/quick_frontend/constants.py b/frontends/src/quick_frontend/constants.py
index fc137152..3ae05ef7 100644
--- a/frontends/src/quick_frontend/constants.py
+++ b/frontends/src/quick_frontend/constants.py
@@ -86,7 +86,8 @@ class Const(constants.Const):
     LISTENERS = {'avatar', 'nick', 'presence', 'profilePlugged', 'disconnect', 'gotMenus', 'menu', 'notification', 'notificationsClear', 'progressFinished', 'progressError'}
 
     # Notifications
-    NOTIFY_MESSAGE = 'MESSAGE'  # a message was received
-    NOTIFY_MENTION = 'MENTION'  # user was mentionned
+    NOTIFY_MESSAGE = 'MESSAGE'  # a message has been received
+    NOTIFY_MENTION = 'MENTION'  # user has been mentionned
     NOTIFY_PROGRESS_END = 'PROGRESS_END'  # a progression has finised
     NOTIFY_GENERIC = 'GENERIC'  # a notification which has not its own type
+    NOTIFY_ALL = (NOTIFY_MESSAGE, NOTIFY_MENTION, NOTIFY_PROGRESS_END, NOTIFY_GENERIC)
diff --git a/frontends/src/quick_frontend/quick_app.py b/frontends/src/quick_frontend/quick_app.py
index 8b3a7162..7676eace 100644
--- a/frontends/src/quick_frontend/quick_app.py
+++ b/frontends/src/quick_frontend/quick_app.py
@@ -636,6 +636,7 @@ class QuickApp(object):
         @param cb_args(list, None): list of args for callback
         @param widget(object, None): widget where the notification happened
         """
+        assert type_ in C.NOTIFY_ALL
         notif_dict = self.profiles[profile].notifications
         key = '' if entity is None else entity.bare
         type_notifs = notif_dict.setdefault(key, {}).setdefault(type_, [])