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-rw-r--r--synapse/handlers/sync.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 4cbb43a31b..fa5e954e01 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -447,6 +447,9 @@ class SyncHandler(BaseHandler):
         )
         now_token = now_token.copy_and_replace("presence_key", presence_key)
 
+        # We now fetch all ephemeral events for this room in order to get
+        # this users current read receipt. This could almost certainly be
+        # optimised.
         _, all_ephemeral_by_room = yield self.ephemeral_by_room(
             sync_config, now_token
         )