prompt clarification

.scripts/prompt

@@ -1,3 +1,8 @@
 #!/bin/sh
+# A dmenu binary prompt script.
+# Gives a dmenu prompt labeled with $1 to perform command $2.
+# For example:
+# `./prompt "Do you want to shutdown?" "shutdown -h now"`
+
 [ $(echo -e "No\nYes" | dmenu -i -p "$1" -nb darkred -sb red -sf white -nf gray -fn mono) \
-== "Yes" ] && "$@:2"
+== "Yes" ] && $2