grub question read-only

["michael" <michael@estone.ca>]

Hi,
I have this in my /boot/grub/menu.lst file. (pasted below)
I'm wondering whey there is an option "ro" on the main
kernel line, even though the system boots normal rw?

What would I do if I actually wanted to boot and have my
system / mounted read only?

Thanks!


## ## End Default Options ##

title           Debian GNU/Linux, kernel 2.6.8-3-686
root            (hd0,0)
kernel          /vmlinuz-2.6.8-3-686 root=/dev/md6 ro
initrd          /initrd.img-2.6.8-3-686
savedefault
boot

title           Debian GNU/Linux, kernel 2.6.8-3-686 (recovery mode)
root            (hd0,0)
kernel          /vmlinuz-2.6.8-3-686 root=/dev/md6 ro single
initrd          /initrd.img-2.6.8-3-686
savedefault
boot

### END DEBIAN AUTOMAGIC KERNELS LIST