The unhappy fact is, making changes is not a quick and easy job thanks to the size of the work and the unfriendly nature of the manuscript behind it. That minor update would take me half an afternoon to edit into place and make public, including replacing the PDF version. I couldn't find chance then, and I can't manage it now without stealing time from two projects which cannot be delayed. I could only give the guide priority in my life for so long and, after well over 100 hours work, it's had more than its share.