1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/rest/admin/rooms.py b/synapse/rest/admin/rooms.py
index 7c292ef3f9..09726d52d6 100644
--- a/synapse/rest/admin/rooms.py
+++ b/synapse/rest/admin/rooms.py
@@ -316,6 +316,9 @@ class JoinRoomAliasServlet(RestServlet):
         join_rules_event = room_state.get((EventTypes.JoinRules, ""))
         if join_rules_event:
             if not (join_rules_event.content.get("join_rule") == JoinRules.PUBLIC):
+                # update_membership with an action of "invite" can raise a
+                # ShadowBanError. This is not handled since it is assumed that
+                # an admin isn't going to call this API with a shadow-banned user.
                 await self.room_member_handler.update_membership(
                     requester=requester,
                     target=fake_requester.user,