diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_Expression.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_Expression.java
index 5fed8b2..907bf46 100644
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_Expression.java
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_Expression.java
@@ -2,6 +2,12 @@ package org.gcube.portlets.user.td.widgetcommonevent.shared.expression;
 
 import java.io.Serializable;
 
+/**
+ * 
+ * @author giancarlo
+ * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *
+ */
 public class C_Expression implements Serializable {