diff --git a/api/client-server/definitions/event_filter.yaml b/api/client-server/definitions/event_filter.yaml
index 8bedacb25..df872af4e 100644
--- a/api/client-server/definitions/event_filter.yaml
+++ b/api/client-server/definitions/event_filter.yaml
@@ -1,3 +1,4 @@
+title: Filter
 properties:
   limit:
     description: The maximum number of events to return.
diff --git a/api/client-server/definitions/room_event_filter.yaml b/api/client-server/definitions/room_event_filter.yaml
index 0ad1ae33b..afd407de3 100644
--- a/api/client-server/definitions/room_event_filter.yaml
+++ b/api/client-server/definitions/room_event_filter.yaml
@@ -1,5 +1,6 @@
 allOf:
 - $ref: event_filter.yaml
+title: RoomEventFilter
 properties:
   not_rooms:
     description: A list of room IDs to exclude. If this list is absent then no rooms
diff --git a/api/client-server/definitions/sync_filter.yaml b/api/client-server/definitions/sync_filter.yaml
index 09307c997..b3d1cd84e 100644
--- a/api/client-server/definitions/sync_filter.yaml
+++ b/api/client-server/definitions/sync_filter.yaml
@@ -25,6 +25,8 @@ properties:
     - $ref: event_filter.yaml
     description: The user account data that isn't associated with rooms to include.
   room:
+    title: RoomFilter
+    description: Filters to be applied to room data.
     properties:
       not_rooms:
         description: A list of room IDs to exclude. If this list is absent then no rooms