password protect for grub2

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http://forums.fedoraforum.org – hi! i want set password in grub2. 1- i create hash of my password : Code: grub2-mkpasswd-pbkdf2 2- i add these code to end of /etc/grub.d/40_custom file : Code: set superusers="root" password_pbkdf2 root grub.pbkdf2.sha512.10000.20F6422..... 3- run this code for apply config : Code: grub2-mkconfig -o /boot/grub2/grub.cfg but when i reboot system, grub do not ask username and password. how i can create password protect for grub2? --- i use fedora 17 (HowTos)