diff --git a/little_boxes/activitypub.py b/little_boxes/activitypub.py
index 52a27ea..7427a05 100644
--- a/little_boxes/activitypub.py
+++ b/little_boxes/activitypub.py
@@ -126,7 +126,7 @@ CREATE_TYPES = [
     ActivityType.VIDEO,
     ActivityType.AUDIO,
     ActivityType.QUESTION,
-    ActivityType.DOCUMENT
+    ActivityType.DOCUMENT,
 ]
 
 COLLECTION_TYPES = [ActivityType.COLLECTION, ActivityType.ORDERED_COLLECTION]