diff --git a/.bin/wacom-vertical-draw-area b/.bin/wacom-vertical-draw-area
index e106388..889449f 100755
--- a/.bin/wacom-vertical-draw-area
+++ b/.bin/wacom-vertical-draw-area
@@ -1,5 +1,10 @@
 #!/usr/bin/env bash
 
+# Note: this script gets called from $HOME/.config/autorandr/docked/postswitch,
+#       default drawing area on my 4K monitor
+
+# Rotate drawing are for vertical drawing
+# (physical controls above drawing area)
 xsetwacom set "Wacom Intuos Pro M Pen stylus" rotate ccw
 xsetwacom set "Wacom Intuos Pro M Finger touch" rotate ccw
 xsetwacom set "Wacom HID 5214 Pen stylus" rotate ccw
@@ -9,6 +14,7 @@ xsetwacom set "Wacom Intuos Pro M Pen cursor" rotate ccw
 xsetwacom set "Wacom HID 5214 Pen eraser" rotate ccw
 xsetwacom set "Wacom Intuos Pro M Pen stylus" rotate ccw
 
+# Set drawing area to left side on 3840x2160 monitor
 xsetwacom set "Wacom Intuos Pro M Pen stylus" MapToOutput 1080x1920+130+130
 xsetwacom set "Wacom Intuos Pro M Finger touch" MapToOutput 1080x1920+130+130
 xsetwacom set "Wacom HID 5214 Pen stylus" MapToOutput 1080x1920+130+130