it was for the well of lost plots (i don't know if UK/USA versions matter)
aw heck; i'll just copy and paste body of the email
Recently I noticed an error in the US Viking Edition of The Well of
Lost Plots; near the top of page 116 Libris says "...Ultraword™ is
reverse compatible...". While this is not strictly an error, as I
consider myself knowledgeable in electronics and software I must point
out that "reverse compatible" is not the correct term. The correct
term is "backwards compatible". For reference please visit
[
en.wikipedia.org]. I have never
heard it using the word "reverse" and Wikipedia says nothing about it,
nor does searching "reverse compatible" redirect to the backward
compatibility page.
Obviously, this is not a heinous error, but I felt it my duty to
point this out, as per your instructions on your book upgrade page.