add an important warning about when exclude don't work`
add an important warning about when exclude don't work`

e-koch/pyspeckit,e-koch/pyspeckit,keflavich/pyspeckit,vlas-sokolov/pyspeckit,keflavich/pyspeckit,mikelum/pyspeckit,pyspeckit/pyspeckit,jpinedaf/pyspeckit,mikelum/pyspeckit,pyspeckit/pyspeckit,low-sky/pyspeckit,jpinedaf/pyspeckit,allisony/pyspeckit,vlas-sokolov/pyspeckit,allisony/pyspeckit,low-sky/pyspeckit