diff --git a/WebSocketLibCommuncationStandard.md b/WebSocketLibCommuncationStandard.md
index 0e9e94d..4fd07ed 100644
--- a/WebSocketLibCommuncationStandard.md
+++ b/WebSocketLibCommuncationStandard.md
@@ -81,6 +81,10 @@ Invalid authentication.
 
 Channel/Module/WebSocket Listeners
 
+### `invalid`
+
+Invalid operations.
+
 ## Message type `SYSTEM`
 
 There are a messages that can only be send by Getiyo and contain general data. The system message packet **always** contains a `type` attribute which specifies the system message type.