post_install() {
    echo 'to use this hook add "wifi" to your mkinitcpio.conf and create a'
    echo 'wpa_supplicant configuration in /etc/wpa_supplicant/initcpio.conf, e.g.:'
    echo 'wpa_passphrase "ESSID" "passphrase" > /etc/wpa_supplicant/initcpio.conf'
    echo 'and rerun mkinitcpio'
}