diff --git a/api/client-server/definitions/sync_filter.yaml b/api/client-server/definitions/sync_filter.yaml
index 4aa78e77..fc154f3a 100644
--- a/api/client-server/definitions/sync_filter.yaml
+++ b/api/client-server/definitions/sync_filter.yaml
@@ -20,6 +20,10 @@ properties:
     allOf:
     - $ref: event_filter.yaml
     description: The presence updates to include.
+  account_data:
+    allOf:
+    - $ref: event_filter.yaml
+    description: The user account data that isn't associated with rooms to include.
   room:
     properties:
       ephemeral:
@@ -38,5 +42,9 @@ properties:
         allOf:
         - $ref: room_event_filter.yaml
         description: The message and state update events to include for rooms.
+      account_data:
+        allOf:
+        - $ref: room_event_filter.yaml
+        description: The per user account data to include for rooms.
     type: object
 type: object