diff --git a/Systems/a320-aerodynamics.xml b/Systems/a320-aerodynamics.xml
index 0d2be42a..e2031dfb 100644
--- a/Systems/a320-aerodynamics.xml
+++ b/Systems/a320-aerodynamics.xml
@@ -515,6 +515,18 @@
 			</product>
 		</function>
 		
+		<function name="aero/moment/Yaw_damp">
+			<description>Yaw moment due to yaw rate</description>
+			<product>
+				<property>aero/qbar-psf</property>
+				<property>metrics/Sw-sqft</property>
+				<property>metrics/bw-ft</property>
+				<property>aero/bi2vel</property>
+				<property>velocities/r-aero-rad_sec</property>
+				<value>-0.1</value>
+			</product>
+		</function>
+		
 		<function name="aero/moment/Yaw_rudder">
 			<description>Yaw moment due to rudder</description>
 			<product>