1 files changed, 5 insertions, 1 deletions

diff --git a/synapse/replication/http/devices.py b/synapse/replication/http/devices.py

index 795ca7b65e..e32aac0a25 100644
--- a/synapse/replication/http/devices.py
+++ b/synapse/replication/http/devices.py
@@ -21,7 +21,11 @@ logger = logging.getLogger(__name__)
 
 
 class ReplicationUserDevicesResyncRestServlet(ReplicationEndpoint):
-    """Notifies that a user has joined or left the room
+    """Ask master to resync the device list for a user by contacting their
+    server.
+
+    This must happen on master so that the results can be correctly cached in
+    the database and streamed to workers.
 
     Request format: