Updated documentation

WebSocketLibCommuncationStandard.md

@@ -28,7 +28,9 @@ Messages are encoded as stringified JSON and **always** includes a `packet` attr
 
 ## Message type `NORMAL`
 
-Normal messaging from module to external service.
+Normal messaging between a module and an external service.
+
+> When sending messages from an external service to a module make sure you specify the `moduleId` in your packet. See the 2nd example below.
 
 ```typescript
 api.Libs.getWebSocket().broadcast('setScore', 'fakePlayerId123', 10);