diff --git a/src/calibre/db/categories.py b/src/calibre/db/categories.py
index 8a4855b6d7..d169e5a5c4 100644
--- a/src/calibre/db/categories.py
+++ b/src/calibre/db/categories.py
@@ -127,6 +127,8 @@ def get_categories(dbcache, sort='name', book_ids=None, icon_map=None):
                 categories['rating'].remove(x)
                 break
 
+    # TODO: User categories and saved searches
+
     return categories