diff --git a/doc/device-configuration-via-udev.dox b/doc/device-configuration-via-udev.dox
index cacbbf1a..4faab93a 100644
--- a/doc/device-configuration-via-udev.dox
+++ b/doc/device-configuration-via-udev.dox
@@ -24,7 +24,7 @@ Example values are:
  ENV{LIBINPUT_CALIBRATION_MATRIX}="0 -1 1 1 0 0" # 90 degree clockwise
  ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 0 -1 1" # 180 degree clockwise
  ENV{LIBINPUT_CALIBRATION_MATRIX}="0 1 0 -1 0 1" # 270 degree clockwise
- ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 1 0 0" # reflect along y axis
+ ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 0 1 0" # reflect along y axis
 @endcode
 </dd>
 <dt>LIBINPUT_DEVICE_GROUP</dt>