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-rw-r--r--synapse/api/filtering.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/api/filtering.py b/synapse/api/filtering.py
index 8c8c7b642e..5287aaa757 100644
--- a/synapse/api/filtering.py
+++ b/synapse/api/filtering.py
@@ -70,6 +70,11 @@ class Filtering(object):
     def _check_definition_room_lists(self, definition):
         """Check that "rooms" and "not_rooms" are lists of room ids if they
         are present
+
+        Args:
+            definition(dict): The filter definition
+        Raises:
+            SynapseError: If there was a problem with this definition.
         """
         # check rooms are valid room IDs
         room_id_keys = ["rooms", "not_rooms"]