diff --git a/api/client-server/v1/rooms.yaml b/api/client-server/v1/rooms.yaml
index 462736031..e7b93ad95 100644
--- a/api/client-server/v1/rooms.yaml
+++ b/api/client-server/v1/rooms.yaml
@@ -314,8 +314,7 @@ paths:
                 "visibility": "private",
                 "private_user_data": [{
                     "type": "m.tag",
-                    "content": {"tags": ["work"]},
-                    "room_id": "!636q39766251:example.com"
+                    "content": {"tags": {"work": {}}}
                 }]
               }
           schema:
diff --git a/api/client-server/v1/sync.yaml b/api/client-server/v1/sync.yaml
index 0f11a98f2..89b9400e9 100644
--- a/api/client-server/v1/sync.yaml
+++ b/api/client-server/v1/sync.yaml
@@ -248,7 +248,7 @@ paths:
                           "visibility": "private",
                           "private_user_data": [{
                             "type": "m.tag",
-                            "content": {"tags": ["work"]}
+                            "content": {"tags": {"work": {}}}
                           }]
                       }
                   ]
diff --git a/api/client-server/v2_alpha/sync.yaml b/api/client-server/v2_alpha/sync.yaml
index 3a1d79db6..b5465601c 100644
--- a/api/client-server/v2_alpha/sync.yaml
+++ b/api/client-server/v2_alpha/sync.yaml
@@ -270,7 +270,7 @@ paths:
                         "events": [
                           {
                             "type": "m.tags",
-                            "content": {"tags": ["work"]}
+                            "content": {"tags": {"work": {}}}
                           }
                         ]
                       }