diff --git a/bookwyrm/models/user.py b/bookwyrm/models/user.py
index f4183812..4d98f5c5 100644
--- a/bookwyrm/models/user.py
+++ b/bookwyrm/models/user.py
@@ -37,6 +37,7 @@ FeedFilterChoices = [
 
 
 def get_feed_filter_choices():
+    """return a list of filter choice keys"""
     return [f[0] for f in FeedFilterChoices]