diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/EntityPath.java b/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/EntityPath.java
index 9519435..3e13f7d 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/EntityPath.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/EntityPath.java
@@ -21,6 +21,10 @@ public class EntityPath {
 	public static final String SOURCE_PATH_PART = "source";
 	public static final String TARGET_PATH_PART = "target";
 	
+	public static final String ADD_PATH_PART = "add";
+	
 	public static final String TYPE_PARAM = "type";
 	public static final String PROPERTIES_PARAM = "properties";
+	
+	
 }