Refer to the error response

content/client-server-api/modules/account_data.md

@@ -26,10 +26,11 @@ These events can also be received in a `/events` response or in the
 
 #### Server Behaviour
 
-Servers MUST reject clients from setting account data for event types
-that the server manages. Currently, this only includes
-[`m.fully_read`](#mfully_read) and [`m.push_rules`](#push-rules-events).
-This applies to both global and room-specific account data.
+Servers MUST reject setting account data for event types
+that the server manages by using a 405 error response.
+Currently, this only includes [`m.fully_read`](#mfully_read)
+and [`m.push_rules`](#push-rules-events). This applies to
+both global and room-specific account data.
 
 {{% boxes/note %}}
 {{% changed-in v="1.10" %}} `m.push_rules` was added to the rejection