diff --git a/libinput.spec b/libinput.spec
index b9c687f..49ae073 100644
--- a/libinput.spec
+++ b/libinput.spec
@@ -58,8 +58,10 @@ Group:          System/Base
 
 # These programs may be absorbed into udev main at a future time
 %description udev
-Sets libinput properties on udev objects such that LIBINPUT_*
-variables are available inside udev rules.
+The libinput udev helper rule will set the LIBINPUT_DEVICE_GROUP
+variable for event devices. Device groups are a labelling system to
+allow callers to identify which libinput devices are part of the same
+physical device.
 
 %package -n %lname
 Summary:        Input device and event processing library