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-rw-r--r--synapse/storage/roommember.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index cb0791e591..63f6115ba9 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -536,6 +536,13 @@ class RoomMemberStore(SQLBaseStore):
     @cachedInlineCallbacks()
     def was_host_joined(self, room_id, host):
         """Check whether the server is or ever was in the room.
+
+        Args:
+            room_id (str)
+            host (str)
+
+        Returns:
+            bool: whether the host is/was in the room or not
         """
         if '%' in host or '_' in host:
             raise Exception("Invalid host name")