-<li>Drivers for ISO-9660, HFS+, and ext4fs, which are not included in rEFIt. (The ISO-9660 driver is based on code from the rEFIt project, but was never completed by its original author. It was completed by Oracle for VirtualBox. The ext4fs driver is derived from the rEFIt ext2fs driver.)</li>
+<li>Drivers for ISO-9660, HFS+, ext4fs, and Btrfs, which are not included in rEFIt. (The ISO-9660 driver is based on code from the rEFIt project, but was never completed by its original author. It was completed by Oracle for VirtualBox. The ext4fs driver is derived from the rEFIt ext2fs driver, and the Btrfs driver is derived from the rEFIt and GRUB 2.0 driver code.)</li>