diff --git a/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java b/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
index 0c47d29..e9a93ea 100644
--- a/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
+++ b/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
@@ -40,7 +40,9 @@ public class ModelConstants {
 
 	public static final String DNET_SUBJECT_KEYWORD = "keyword";
 
-	public static final String DNET_SUBJECT_FOS = "FOS";
+	public static final String DNET_SUBJECT_FOS_CLASSID = "FOS";
+
+	public static final String DNET_SUBJECT_FOS_CLASSNAME = "Fields of Science and Technology classification";
 
 	public static final String DNET_SUBJECT_TYPOLOGIES = "dnet:subject_classification_typologies";
 	public static final String DNET_RESULT_TYPOLOGIES = "dnet:result_typologies";