I ever have installed Debian linux at my computer , which resides at /dev/sda1 (boot) ,and /dev/sda2(root).
However,today I installed slackware at /dev/sda3(boot), /devsda5(root) ,/dev/sda6(swap) ,during which I just installed Lilo on the very start of /dev/sda3 . The install script told me that I can make it known to my bootloader on MBR,
but I just don't know how to do it .

So when I reboot ,it start into Debian ,how can I make GRUB(on MBR) recognize my slackware? any one help? really appreciate!!