clarify previous fs and serial changes
clarify previous fs and serial changes

joyent/rfd,davepacheco/rfd,melloc/rfd,melloc/rfd,davepacheco/rfd,davepacheco/rfd,davepacheco/rfd,davepacheco/rfd,joyent/rfd,joyent/rfd,joyent/rfd,melloc/rfd