minor cleanup, add comment
minor cleanup, add comment

Ignore-this: 1639d26b314e30a6abec98a95050f131

darcs-hash:20100602103440-dcabc-98cb530ee4ef02d427d716daa4cb2c0d0dbe93fb.gz

sjfloat/accelerate,wilbowma/accelerate,wilbowma/accelerate,rrnewton/accelerate,robeverest/accelerate,robeverest/accelerate