diff --git a/src/main/java/org/gcube/datacatalogue/common/Constants.java b/src/main/java/org/gcube/datacatalogue/common/Constants.java
index b53fd84..a92e72d 100644
--- a/src/main/java/org/gcube/datacatalogue/common/Constants.java
+++ b/src/main/java/org/gcube/datacatalogue/common/Constants.java
@@ -1,8 +1,5 @@
 package org.gcube.datacatalogue.common;
 
-
-
-
 /**
  * Constants shared between manager panel and service
  * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
@@ -52,7 +49,7 @@ public class Constants {
 	public static final String GRSF_TYPE_JSON_KEY = "grsf_type";
 	public static final String MANAGEMENT_ENTITIES_CUSTOM_KEY = "Management Body/Authority(ies)";
 	public static final String MANAGEMENT_ENTITIES_JSON_KEY = "management_body_authorities";
-	
+
 	// for connected records
 	public static final String CONNECTED_CUSTOM_KEY = "Connected Record";
 	public static final String CONNECTED_JSON_KEY =  "connected";
@@ -171,6 +168,14 @@ public class Constants {
 	public static final String SOURCE_DOMAIN = "source_domain";
 	public static final String UPDATE_RESULT = "update_result";
 	public static final String ERROR_MESSAGE = "error_message";
+	public static final String ADMINISTRATOR_FULLNAME = "administrator_name";
+
+	// for the annotation messages at server side
+	public static final String ANNOTATION_PUBLISHER_CUSTOM_KEY = "Annotations";
+	public static final String ANNOTATION_PUBLISHER_JSON_KEY = "annotations";
+	public static final String ANNOTATION_ADMIN_JSON_KEY = "admin";
+	public static final String ANNOTATION_MESSAGE_JSON_KEY = ANNOTATION;
+	public static final String ANNOTATION_TIME_JSON_KEY = "time";
 
 	// discover the endpoint of the grsf updater on IS
 	public static final String GRSF_UPDATER_SERVICE  = "GRSFUpdaterEndPoint";