diff --git a/apps/timetable/serialziers.py b/apps/timetable/serialziers.py
index f7ae4204..48c8374d 100644
--- a/apps/timetable/serialziers.py
+++ b/apps/timetable/serialziers.py
@@ -20,6 +20,7 @@ class ScheduleRUDSerializer(serializers.ModelSerializer):
     dinner_end = serializers.TimeField(required=False)
     opening_at = serializers.TimeField(required=False)
     closed_at = serializers.TimeField(required=False)
+    # For permission!!
     establishment_id = serializers.ReadOnlyField(source='establishment.id')
 
     class Meta:
@@ -38,7 +39,6 @@ class ScheduleRUDSerializer(serializers.ModelSerializer):
             'establishment_id'
         ]
 
-
     def validate(self, attrs):
         """Override validate method"""
         establishment_pk = self.context.get('request')\