diff --git a/xsd/netex_part_2/part2_journeyTimes/netex_vehicleJourneyFrequency_support.xsd b/xsd/netex_part_2/part2_journeyTimes/netex_vehicleJourneyFrequency_support.xsd
index ea8bf20aa..2bdad8d51 100644
--- a/xsd/netex_part_2/part2_journeyTimes/netex_vehicleJourneyFrequency_support.xsd
+++ b/xsd/netex_part_2/part2_journeyTimes/netex_vehicleJourneyFrequency_support.xsd
@@ -135,9 +135,21 @@ Rail transport, Roads and Road transport
 			<xsd:documentation>Allowed values for headway use.</xsd:documentation>
 		</xsd:annotation>
 		<xsd:restriction base="xsd:normalizedString">
-			<xsd:enumeration value="DisplayPassingTimesOnly"/>
-			<xsd:enumeration value="DisplayAsWellAsPassingTimes"/>
-			<xsd:enumeration value="DisplayInsteadOfPassingTimes"/>
+			<xsd:enumeration value="DisplayPassingTimesOnly">
+				<xsd:annotation>
+					<xsd:documentation>You have a headway service but still display passing times only.</xsd:documentation>
+				</xsd:annotation>
+			</xsd:enumeration>
+			<xsd:enumeration value="DisplayAsWellAsPassingTimes">
+				<xsd:annotation>
+					<xsd:documentation>You have a headway service and display both passing times and frequency.</xsd:documentation>
+				</xsd:annotation>
+			</xsd:enumeration>
+			<xsd:enumeration value="DisplayInsteadOfPassingTimes">
+				<xsd:annotation>
+					<xsd:documentation>You have a headway service and only display frequency.</xsd:documentation>
+				</xsd:annotation>
+			</xsd:enumeration>
 		</xsd:restriction>
 	</xsd:simpleType>
 	<xsd:simpleType name="HeadwayJourneyGroupIdType">