Reviewer 2 here is telling me 'You need to add multiple citations from Author1, Author 2, Author 3, Author 4, Author 5, and Author 6.'
Dude, WHICH ONES? Don't make me read your mind! If you think there's relevant work I missed, TELL ME WHAT IT IS!
Saying the equivalent of, 'Oh, my buddies Joe, Lynn, Sue, Mark, Dave, and Halbert have all worked on stuff related to this. You should cite them' is really, really bad form.