diff --git a/CDT-subscription.xsd b/CDT-subscription.xsd
index 37b364086c7b782e8749ce310ce27400508fa74d..5d4b81a99f9299d50d5aec17742649e51cec63ba 100644
--- a/CDT-subscription.xsd
+++ b/CDT-subscription.xsd
@@ -56,7 +56,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 						<xs:element name="notificationEventCat" type="m2m:eventCat" minOccurs="0" />
 						<xs:element name="subscriberURI" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="associatedCrossResourceSub" type="m2m:listOfURIs" minOccurs="0" />					
-						<xs:element name="notificationStatsEnable" type="xs:boolean"/>
+						<xs:element name="notificationStatsEnable" type="xs:boolean" minOccurs="0"/>
 						<xs:element name="notificationStatsInfo" type="m2m:setOfNotificationStatsInfo" minOccurs="0" />					
 						<xs:element name="primitiveProfileID" type="xs:anyURI" minOccurs="0" />