documentation for augmentations in .eh_frame?

[David Mosberger]

Is there any documentation (other than the source-code) that describes
the augmentations used in the .eh_frame section?  Between DWARF3 and
LSB v1.3, I found a description of most everything else related to
stack unwinding, but the augmentations don't seem to be documented
anywhere.  Or am I missing something?

Thanks,

	--david