YES! I remembered something about extend, but couldn't find it anywhere. That solved my problem.
It might be a good idea to add that to the doc string for `org-src-block-faces`, maybe with some version note that it applies to.
Thanks so much!
John
----------------------------------- Professor John Kitchin (he/him/his) Doherty Hall A207F Department of Chemical Engineering Carnegie Mellon University Pittsburgh, PA 15213 412-268-7803