diff --git a/event-schemas/schema/v1/m.room.create b/event-schemas/schema/v1/m.room.create
index f2e1ee92..348b6d86 100644
--- a/event-schemas/schema/v1/m.room.create
+++ b/event-schemas/schema/v1/m.room.create
@@ -12,6 +12,10 @@
                 "creator": {
                     "type": "string",
                     "description": "The ``user_id`` of the room creator. This is set by the homeserver."
+                },
+                "m.federate": {
+                    "type": "boolean",
+                    "description": "Whether users on other servers can join this room. Defaults to ``true`` if key does not exist."
                 }
             },
             "required": ["creator"]
diff --git a/specification/1-client_server_api.rst b/specification/1-client_server_api.rst
index 51e9b00b..c63742d1 100644
--- a/specification/1-client_server_api.rst
+++ b/specification/1-client_server_api.rst
@@ -779,6 +779,18 @@ options which can be set when creating a room:
     This will tell the server to invite everyone in the list to the newly
     created room.
 
+``creation_content``
+  Type:
+    Object
+  Optional:
+    Yes
+  Value:
+    Extra keys to be added to the content of the ``m.room.create``. The server
+    will clober the following keys: ``creator``. Future versions of this
+    spec may allow the server to clobber other keys if required.
+  Description:
+    Allows clients to add keys to the content of ``m.room.create``.
+
 ``preset``
   Type:
     String
@@ -822,7 +834,10 @@ Example::
     "preset": "public_chat",
     "room_alias_name": "thepub",
     "name": "The Grand Duke Pub",
-    "topic": "All about happy hour"
+    "topic": "All about happy hour",
+    "creation_content": {
+        "m.federate": false
+    }
   }
 
 The home server will create a ``m.room.create`` event when the room is created,