diff --git a/Aircraft/Instruments-3d/glider/vario/S3/README.install b/Aircraft/Instruments-3d/glider/vario/S3/README.install
index e04d8eb36..9372db8d4 100644
--- a/Aircraft/Instruments-3d/glider/vario/S3/README.install
+++ b/Aircraft/Instruments-3d/glider/vario/S3/README.install
@@ -48,7 +48,7 @@ To install this instrument into your aircraft, you need to do the following:
 				<value>0.01</value>
 			</greater-than>
 			<greater-than-equals>
-				<property>/systems/electrical/outputs/s3</property>
+				<property>/systems/electrical/outputs/S3</property>
 				<value>9</value>
 			</greater-than-equals>
 			<equals>