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-rw-r--r--synapse/handlers/message.py5
1 files changed, 3 insertions, 2 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 6d136930bf..3e9a22e8f3 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -835,8 +835,9 @@ class EventCreationHandler:
             ShadowBanError if the requester has been shadow-banned.
         """
 
-        # we don't apply shadow-banning to membership events, so that the user
-        # can come and go as they want.
+        # we don't apply shadow-banning to membership events here. Invites are blocked
+        # higher up the stack, and we allow shadow-banned users to send join and leave
+        # events as normal.
         if (
             event.type != EventTypes.Member
             and not ignore_shadow_ban