Updates documentation

docs/clmc-service.md

@@ -228,7 +228,7 @@ with **/clmc-service** so that the nginx reverse proxy server (listening on port
         The response of this request is a JSON content, which contains a generated UUID and the database name. 
         This request UUID can then be used to manage the pipeline script (e.g. stopping it).
 
-        Returns a 400 Bad Request error if the request body is invalid.
+        Returns a 400 Bad Request error if the request body is invalid or the graph network topology has not been built, yet.
      
     * Response Body Example: