Bug#760791: closed by Bastian Blank <waldi at debian.org> (Re: Bug#760791: lvm2: add dependency to thin-provisioning-tools)

[Bernd Kubu]

I would suggest adding at least a comment somewhere about that fact. 
It´s a bit annoying, if you setup the lvm-cache and after a reboot 
(possibly weeks later), the volume doesn´t come up and you need to 
install an additional package. Especially the name 
“thin-provisioning-tools” does not imply the need for the lvm-cache.