diff --git a/src/main/java/org/gcube/informationsystem/service/dto/FacetPropertyDTO.java b/src/main/java/org/gcube/informationsystem/service/dto/FacetPropertyDTO.java
index 8ea0744..8472b58 100644
--- a/src/main/java/org/gcube/informationsystem/service/dto/FacetPropertyDTO.java
+++ b/src/main/java/org/gcube/informationsystem/service/dto/FacetPropertyDTO.java
@@ -21,6 +21,7 @@ public class FacetPropertyDTO {
 	private String type;
 	private String name;
 	private String description;
+	//per validazione
 	private boolean mandatory;
 	private boolean notnull;
 	private String regexp;