diff --git a/changelogs/client_server/newsfragments/3330.clarification b/changelogs/client_server/newsfragments/3330.clarification
new file mode 100644
index 00000000..5df676a1
--- /dev/null
+++ b/changelogs/client_server/newsfragments/3330.clarification
@@ -0,0 +1 @@
+Add titles for OpenAPI objects.
diff --git a/data/api/client-server/definitions/errors/error.yaml b/data/api/client-server/definitions/errors/error.yaml
index 7471da6f..89a0d44f 100644
--- a/data/api/client-server/definitions/errors/error.yaml
+++ b/data/api/client-server/definitions/errors/error.yaml
@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 type: object
+title: Error
 description: A Matrix-level Error
 properties:
   errcode:
@@ -22,4 +23,4 @@ properties:
     type: string
     description: A human-readable error message.
     example: An unknown error occurred
-required: ["errcode"]
\ No newline at end of file
+required: ["errcode"]
diff --git a/data/api/client-server/definitions/errors/rate_limited.yaml b/data/api/client-server/definitions/errors/rate_limited.yaml
index aca82ce7..1530458b 100644
--- a/data/api/client-server/definitions/errors/rate_limited.yaml
+++ b/data/api/client-server/definitions/errors/rate_limited.yaml
@@ -13,6 +13,7 @@
 # limitations under the License.
 $ref: error.yaml
 type: object
+title: RateLimitError
 description: The rate limit was reached for this request
 properties:
   errcode:
@@ -29,4 +30,4 @@ properties:
       The amount of time in milliseconds the client should wait
       before trying the request again.
     example: 2000
-required: ["errcode"]
\ No newline at end of file
+required: ["errcode"]
diff --git a/data/api/client-server/definitions/event_batch.yaml b/data/api/client-server/definitions/event_batch.yaml
index 1694652c..e326184c 100644
--- a/data/api/client-server/definitions/event_batch.yaml
+++ b/data/api/client-server/definitions/event_batch.yaml
@@ -21,3 +21,4 @@ properties:
       type: object
     type: array
 type: object
+title: EventBatch
diff --git a/data/api/client-server/definitions/openid_token.yaml b/data/api/client-server/definitions/openid_token.yaml
index 32929ef6..e74ddfff 100644
--- a/data/api/client-server/definitions/openid_token.yaml
+++ b/data/api/client-server/definitions/openid_token.yaml
@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 type: object
+title: OpenIdCredentials
 properties:
   access_token:
     type: string
diff --git a/data/api/client-server/definitions/request_token_response.yaml b/data/api/client-server/definitions/request_token_response.yaml
index aa9379f6..0f8c8cab 100644
--- a/data/api/client-server/definitions/request_token_response.yaml
+++ b/data/api/client-server/definitions/request_token_response.yaml
@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 type: object
+title: RequestTokenResponse
 properties:
   sid:
     type: string
diff --git a/data/api/client-server/definitions/room_event_batch.yaml b/data/api/client-server/definitions/room_event_batch.yaml
index 45bcb423..4a7dab19 100644
--- a/data/api/client-server/definitions/room_event_batch.yaml
+++ b/data/api/client-server/definitions/room_event_batch.yaml
@@ -25,3 +25,4 @@ properties:
       - origin_server_ts
     type: array
 type: object
+title: RoomEventBatch
diff --git a/data/api/client-server/definitions/state_event_batch.yaml b/data/api/client-server/definitions/state_event_batch.yaml
index 9518300f..f3966dcd 100644
--- a/data/api/client-server/definitions/state_event_batch.yaml
+++ b/data/api/client-server/definitions/state_event_batch.yaml
@@ -26,3 +26,4 @@ properties:
       - state_key
     type: array
 type: object
+title: StateEventBatch
diff --git a/data/api/client-server/definitions/timeline_batch.yaml b/data/api/client-server/definitions/timeline_batch.yaml
index e243b485..65a7622a 100644
--- a/data/api/client-server/definitions/timeline_batch.yaml
+++ b/data/api/client-server/definitions/timeline_batch.yaml
@@ -24,3 +24,4 @@ properties:
       rooms/{roomId}/messages endpoint.
     type: string
 type: object
+title: TimelineBatch
diff --git a/data/api/client-server/key_backup.yaml b/data/api/client-server/key_backup.yaml
index f52309f1..43851791 100644
--- a/data/api/client-server/key_backup.yaml
+++ b/data/api/client-server/key_backup.yaml
@@ -409,6 +409,7 @@ paths:
           description: The update succeeded.
           schema:
             type: object
+            title: RoomKeysUpdateResponse
             properties:
               etag:
                 description: |-
@@ -521,6 +522,7 @@ paths:
           description: The update succeeded
           schema:
             type: object
+            title: RoomKeysUpdateResponse
             properties:
               etag:
                 description: |-
@@ -584,6 +586,7 @@ paths:
           description: The update succeeded
           schema:
             type: object
+            title: RoomKeysUpdateResponse
             properties:
               etag:
                 description: |-
@@ -698,6 +701,7 @@ paths:
           description: The update succeeded
           schema:
             type: object
+            title: RoomKeysUpdateResponse
             properties:
               etag:
                 description: |-
@@ -781,6 +785,7 @@ paths:
           description: The update succeeded
           schema:
             type: object
+            title: RoomKeysUpdateResponse
             properties:
               etag:
                 description: |-
@@ -905,6 +910,7 @@ paths:
           description: The update succeeded
           schema:
             type: object
+            title: RoomKeysUpdateResponse
             properties:
               etag:
                 description: |-