diff --git a/src/main/java/org/gcube/applicationsupportlayer/social/NotificationManager.java b/src/main/java/org/gcube/applicationsupportlayer/social/NotificationManager.java
index bb05af7..9de7c33 100644
--- a/src/main/java/org/gcube/applicationsupportlayer/social/NotificationManager.java
+++ b/src/main/java/org/gcube/applicationsupportlayer/social/NotificationManager.java
@@ -86,7 +86,7 @@ public interface NotificationManager {
 	 *  
 	 * @param userIdToNotify the user you want to notify
 	 * @param likedFeed the {@link Feed} instance someone liked
-	 * @return
+	 * @return true if the notification is correctly delivered, false otherwise
 	 */
 	boolean notifyLikedFeed(String userIdToNotify, Feed likedFeed);