diff --git a/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnExpressionDialog.java b/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnExpressionDialog.java
index 4cb2cc5..ad3c43e 100644
--- a/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnExpressionDialog.java
+++ b/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnExpressionDialog.java
@@ -42,7 +42,12 @@ public class ColumnExpressionDialog extends Window {
 	private TRId trId;
 	private String columnId = null;
 	private EventBus eventBus;
-
+	
+	/**
+	 * 
+	 * @param columnMockUp
+	 * @param eventBus
+	 */
 	public ColumnExpressionDialog(
 			ColumnMockUp columnMockUp,
 			EventBus eventBus) {
@@ -57,6 +62,12 @@ public class ColumnExpressionDialog extends Window {
 
 	}
 
+	/**
+	 * 
+	 * @param trId
+	 * @param columnId
+	 * @param eventBus
+	 */
 	public ColumnExpressionDialog(TRId trId, String columnId,
 			EventBus eventBus) {
 		initWindow();