13.04 - How do I use/enable zcache?

I'd like to try out zcache but I just can't figure out how I would enable it, do I have to compile a new kernel with zcache enabled? I'm running Ubuntu 13.04 64bit

Ok I figured it out, I just added zcache to the GRUB_CMDLINE_LINUX_DEFAULT line in /etc/default/grub file, then ran sudo update-grub.

Example:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash zcache"