diff --git a/CDT-enumerationTypes.xsd b/CDT-enumerationTypes.xsd
index 994ca3073dc99aa0a61f4b517602faa4a304c621..4cc6123fe3b301c798228172fa83f8cc138ca533 100644
--- a/CDT-enumerationTypes.xsd
+++ b/CDT-enumerationTypes.xsd
@@ -237,6 +237,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 			<xs:enumeration value="7" />
 			<!-- Child Resources -->
 			<xs:enumeration value="8" />
+			<!-- Modified Attributes -->
+			<xs:enumeration value="9" />
 		</xs:restriction>
 	</xs:simpleType>