Peer reviewer: "Why didn't she cite Xia 2007 and Xia 2008?" Me: "I literally have no idea I did the article selection like a year ago."
Me: *starts reading Xia 2007* ah right these all have to do with UK and Australian repositories and I was like "this is going to be US only because of differences in academic cultures and funding and whatnot"
I can still add Xia to the lit review if apparently this is a glaring omission, however I'm going to have to use that caveat.