diff --git a/nxdlTypes.xsd b/nxdlTypes.xsd
index 9acef2c9bf..8c961b50b0 100644
--- a/nxdlTypes.xsd
+++ b/nxdlTypes.xsd
@@ -78,7 +78,6 @@
 			nxdl:NX_UNITLESS
 			nxdl:NX_VOLTAGE
 			nxdl:NX_VOLUME
-			nxdl:NX_UNITLESS
 			nxdl:NX_WAVELENGTH
 			nxdl:NX_WAVENUMBER
 			" />
@@ -384,6 +383,7 @@
 			<xs:documentation>
 				for fields that don't have a unit (e.g. hkl) so that they don't 
 				inherit the wrong units (NOTE: not the same as NX_DIMENSIONLESS)
+				<xs:element name="example">``""``</xs:element>
 			</xs:documentation>
 		</xs:annotation>
 		<xs:restriction base="xs:string" />