Here is a link to a crossword published by The Guardian (UK newspaper).
As happens from time to time, the puzzle is headed by a brief note marked Special Instructions.
My friends and I invariably refer to that text as the byline, but we all agree this isn't the right word. Possibly there isn't one. I doubt there's a really common name for it, or The Guardian would have written that instead of Special Instructions.
Is there a more appropriate term out there?