diff --git a/src/main/java/org/gcube/gcat/api/moderation/Moderated.java b/src/main/java/org/gcube/gcat/api/moderation/Moderated.java
index eee83a4..c4df5c8 100644
--- a/src/main/java/org/gcube/gcat/api/moderation/Moderated.java
+++ b/src/main/java/org/gcube/gcat/api/moderation/Moderated.java
@@ -12,6 +12,7 @@ public interface Moderated {
 	public static final String SYSTEM_CM_PREFIX = "system:cm_";
 	public static final String SYSTEM_CM_ITEM_STATUS = SYSTEM_CM_PREFIX + "item_status";
 	public static final String SYSTEM_CM_ITEM_VISIBILITY = SYSTEM_CM_PREFIX + "item_visibility";
+	public static final String SYSTEM_CM_ITEM_AUTHOR = SYSTEM_CM_PREFIX + "item_author";
 
 	public String approve(String moderatorMessage);