+<li><b>Btrfs</b>—</b>Samuel Liao contributed this driver, which is
+ based on the rEFIt/rEFInd driver framework and algorithms from the GRUB
+ 2.0 Btrfs driver. As of rEFInd 0.7.0, this driver is new and should be
+ considered experimental. I've tested this driver with a simple
+ one-partition filesystem and with a filesystem that spans two physical
+ devices (although I've made no attempt to ensure that the driver can
+ actually read files written to both devices). Lamuel Liao has used the
+ 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>
+