Grub2 won't add entry for btrfs partition

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http://forums.fedoraforum.org – I have a laptop that I multiboot, which includes a Fedora 19 install with btrfs. Today, I installed rawhide on an extra partition, again using btrfs. Although when running grub2-mkconfig it saw the F19 install, it didn't add it to the grub menu. I wasn't able to get a custom.cfg grub menu to work with it either. I booted into the F19 install by booting from a USB, choosing rescue, and installing its grub. I then, on the F19 install, once again ran grub2-mkconfig and had the same results I had had with rawhide--it would output information about the install, but not add it to the grub men (HowTos)