diff --git a/bin/apple-display-brightness b/bin/apple-display-brightness
index b1f6c9e..8d091f8 100755
--- a/bin/apple-display-brightness
+++ b/bin/apple-display-brightness
@@ -1,3 +1,7 @@
 #!/bin/bash
 
-sudo asdcontrol $(sudo asdcontrol --detect /dev/usb/hiddev* | grep ^/dev/usb/hiddev | cut -d: -f1) -- "$1"
+if [[ -z "$1" ]]; then
+  echo "Adjust Apple Display Brightness by passing +5000 or -5000 (or any range from 0-60000)"
+else
+  sudo asdcontrol $(sudo asdcontrol --detect /dev/usb/hiddev* | grep ^/dev/usb/hiddev | cut -d: -f1) -- "$1"
+fi