added a note on ivar
added a note on ivar

albireox/marvin,bretthandrews/marvin,albireox/marvin,sdss/marvin,bretthandrews/marvin,sdss/marvin,bretthandrews/marvin,sdss/marvin,bretthandrews/marvin,sdss/marvin,albireox/marvin,albireox/marvin