diff --git a/base_classes/NXsensor.nxdl.xml b/base_classes/NXsensor.nxdl.xml
index cdfc11ab04..460e29724b 100644
--- a/base_classes/NXsensor.nxdl.xml
+++ b/base_classes/NXsensor.nxdl.xml
@@ -64,6 +64,9 @@
 			<item value="strain" />
 			<item value="shear" />
 			<item value="surface_pressure" />
+			<item value="humidity" />
+			<item value="viscosity" />
+			<item value="concentration" />
 		</enumeration>
 	</field>
 	<field name="type">