diff --git a/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/workspace/WorkspaceEvent.java b/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/workspace/WorkspaceEvent.java
index 73afcad..fb06861 100644
--- a/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/workspace/WorkspaceEvent.java
+++ b/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/workspace/WorkspaceEvent.java
@@ -28,6 +28,11 @@ public abstract class WorkspaceEvent {
 	@JsonProperty("idsToNotify")
 	@NotNull(message="recipients cannot be missing, use usernames or contexts")
 	protected String[] idsToNotify;	
+	
+	/**
+	 * optional, set to true if the idsToNotify are contexts, default is false
+	 */
+	@JsonProperty("idsAsGroup")
 	protected boolean idsAsGroup = false;
 	
 	WorkspaceEvent(WorkspaceEventType TYPE) {