- driver with a compressed Btrfs volume. I don't know if the driver will
- handle other advanced Btrfs features, such as snapshots and
- subvolumes.</li>
+ driver with a compressed Btrfs volume. The driver will handle
+ subvolumes, but you may need to add kernel options if you're booting a
+ Linux kernel directly from a filesystem that uses subvolumes. For
+ instance, on a test installation of Ubuntu 14.04 alpha on such a
+ system, I needed to set <tt>also_scan_dirs + @/boot</tt> in
+ <tt>refind.conf</tt> and add <tt>rootflags=subvol=@</tt> to the kernel
+ options in my <tt>refind_linux.conf</tt> file. Without the first of
+ these options, rEFInd could not locate my kernel; and without the
+ second, the boot failed with a message to the effect that the initial
+ RAM disk could not find <tt>/sbin/init</tt>.</li>