diff --git a/src/main/java/org/gridsuite/study/notification/server/NotificationWebSocketHandler.java b/src/main/java/org/gridsuite/study/notification/server/NotificationWebSocketHandler.java
index 5c9f7cf..32df8a7 100644
--- a/src/main/java/org/gridsuite/study/notification/server/NotificationWebSocketHandler.java
+++ b/src/main/java/org/gridsuite/study/notification/server/NotificationWebSocketHandler.java
@@ -68,7 +68,9 @@ public class NotificationWebSocketHandler implements WebSocketHandler {
     static final String HEADER_ERROR = "error";
     static final String HEADER_SUBSTATIONS_IDS = "substationsIds";
     static final String HEADER_NODE = "node";
+    static final String HEADER_ROOT_NETWORK = "rootNetwork";
     static final String HEADER_NODES = "nodes";
+    static final String HEADER_ROOT_NETWORKS = "rootNetworks";
     static final String HEADER_PARENT_NODE = "parentNode";
     static final String HEADER_NEW_NODE = "newNode";
     static final String HEADER_MOVED_NODE = "movedNode";
@@ -143,7 +145,9 @@ private static Map<String, Object> toResultHeader(Map<String, Object> messageHea
         passHeader(messageHeader, resHeader, HEADER_INSERT_MODE);
         passHeader(messageHeader, resHeader, HEADER_REMOVE_CHILDREN);
         passHeader(messageHeader, resHeader, HEADER_NODE);
+        passHeader(messageHeader, resHeader, HEADER_ROOT_NETWORK);
         passHeader(messageHeader, resHeader, HEADER_NODES);
+        passHeader(messageHeader, resHeader, HEADER_ROOT_NETWORKS);
         passHeader(messageHeader, resHeader, HEADER_NEW_NODE);
         passHeader(messageHeader, resHeader, HEADER_MOVED_NODE);
         passHeader(messageHeader, resHeader, HEADER_USER_ID); // to filter the display of error messages in the front end