@oblomov Fun story! 😅
We originally printed vol. 1 without it on the cover, too. It only got added when we reprinted. Vol. 2 got printed shortly after the first Vol. 1 printing, and so we wanted it to look like the first print of Vol. 1. People started asking which book was which, so we added it to the front for every subsequent printing. Volume 4 backers got some of the very last copies of that original Vol. 2 print run.