yes, that looks like the one. I think I was using the conditional jump, so it could have been djnz, but I think it was jr. 1 byte jump offset, and I recall my little function bumping against that limit - I might have re-arranged it.
http://z80-heaven.wikidot.com/instructions-set:jr
We should just go with numbers in general in order to play it safe. The new guidance from legal is absolutely no numbers on invoices for liability reasons. Similar to the removal of actual math from math class we're going to let the experts figure out how to implement it.