diff --git a/base_classes/NXentry.nxdl.xml b/base_classes/NXentry.nxdl.xml
index eba9afd33c..8795292a3a 100644
--- a/base_classes/NXentry.nxdl.xml
+++ b/base_classes/NXentry.nxdl.xml
@@ -116,6 +116,10 @@
 	<field name="entry_identifier">
 		<doc>unique identifier for the measurement, defined by the facility.</doc>
 	</field>
+	<field name="entry_identifier_uuid">
+		<doc>UUID identifier for the measurement.</doc>
+		<attribute name="version"><doc>Version of UUID used</doc></attribute>
+	</field>
 	<field name="features">
 		<doc>
 			Reserved for future use by NIAC.