tools: specify width by height in the edge-detector help

Fixes #13

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/touchpad-edge-detector.c b/tools/touchpad-edge-detector.c
index 5dddc6a..8b16cd7 100644
--- a/tools/touchpad-edge-detector.c
+++ b/tools/touchpad-edge-detector.c
@@ -47,7 +47,7 @@ usage(void) {
 	printf("\n");
 	printf("This tool reads the touchpad events from the kernel and calculates\n "
 	       "the minimum and maximum for the x and y coordinates, respectively.\n"
-	       "The first argument is the physical size of the touchpad in mm.\n");
+	       "The first argument is the physical size of the touchpad in mm (WIDTHxHEIGHT).\n");
 	return 1;
 }