1 files changed, 5 insertions, 1 deletions
diff --git a/synapse/rest/client/sync.py b/synapse/rest/client/sync.py
index c607d08de5..4f2c552af2 100644
--- a/synapse/rest/client/sync.py
+++ b/synapse/rest/client/sync.py
@@ -1152,10 +1152,14 @@ class SlidingSyncRestServlet(RestServlet):
 
         if extensions.receipts is not None:
             serialized_extensions["receipts"] = {
-                # Same as the the top-level `account_data.events` field in Sync v2.
                 "rooms": extensions.receipts.room_id_to_receipt_map,
             }
 
+        if extensions.typing is not None:
+            serialized_extensions["typing"] = {
+                "rooms": extensions.typing.room_id_to_typing_map,
+            }
+
         return serialized_extensions