--- a/src/notes/api/views/core.py	Tue Jun 27 13:12:19 2017 +0200
+++ b/src/notes/api/views/core.py	Tue Jun 27 18:11:40 2017 +0200
@@ -1,7 +1,7 @@
 import logging
 
 from notes.models import Note, Session
-from rest_framework import viewsets
+from rest_framework import viewsets, serializers
 
 from ..permissions import NotePermission, SessionPermission
 from ..serializers.core import (DetailNoteSerializer, UpdateNoteSerializer, DetailSessionSerializer, CreateNoteSerializer,