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-rw-r--r--synapse/handlers/groups_local.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/handlers/groups_local.py b/synapse/handlers/groups_local.py
index cb7e7d49cb..173315af6c 100644
--- a/synapse/handlers/groups_local.py
+++ b/synapse/handlers/groups_local.py
@@ -41,6 +41,11 @@ def _create_rerouter(func_name):
                 destination, group_id, *args, **kwargs
             )
 
+            # Capture errors returned by the remote homeserver and
+            # re-throw specific errors as SynapseErrors. This is so
+            # when the remote end responds with things like 403 Not
+            # In Group, we can communicate that to the client instead
+            # of a 500.
             def h(failure):
                 failure.trap(HttpResponseException)
                 e = failure.value