diff --git a/protocol-spec/core.md b/protocol-spec/core.md
index b830602..ea7dd8b 100644
--- a/protocol-spec/core.md
+++ b/protocol-spec/core.md
@@ -4,7 +4,6 @@
   - [Transport](#transport)
   - [Entity ID](#entity-id)
   - [BaseMessage](#basemessage)
-  - [User devices](#user-devices)
 
 ## Transport
 For starting we simply use JSON + Websockets.
@@ -64,8 +63,4 @@ interface BaseMessage {
      */
     payload: Map<K,V>
 }
-```
-
-## User devices
-`todo`
-
+```
\ No newline at end of file