diff --git a/pkg/de-p1st-rotate/etc/de-p1st-rotate/config.cfg b/pkg/de-p1st-rotate/etc/de-p1st-rotate/config.cfg
index 1166210..954eb68 100644
--- a/pkg/de-p1st-rotate/etc/de-p1st-rotate/config.cfg
+++ b/pkg/de-p1st-rotate/etc/de-p1st-rotate/config.cfg
@@ -1,7 +1,9 @@
-# The screen to rotate
+# The screen to rotate.
+# One can list all screens with "xrandr --listmonitors".
 SCREEN=eDP-1  # other values could be "eDP1" or "HDMI1"
 
-# xinput devices to rotate together with the screen
+# xinput devices to rotate together with the screen.
+# One can list all xinput devices with "xinput --list".
 DEVICES=()
 #DEVICES+=( 'pointer:Wacom Pen and multitouch sensor Finger touch' ) # LenovoYoga460
 #DEVICES+=( 'pointer:Wacom Pen and multitouch sensor Pen stylus' )   # LenovoYoga460