Home on LVM

Hello to the Trisquel community!

I'm trying to mount a partition I have on an lvm vg during boot, but have no idea how to. After investigating a little bit, found out that initramfs scripts are set on /usr/share/initramfs-tools, so I pretend to create a script to do:

vgscan
vgchange -a y

and then mount the filesystem within the init process. The filesystem was set on /etc/fstab, so to let init take care of it.
I took 3 days to search on the Ubuntu and Trisquel documentation about initramfs and how it's structure is, but found nothing related to Trisquel specifics.
Does anyone know where can I find initramfs documentation for Trisquel, or else can someone explain to me how the initramfs-tool works so I can set my own script?