Enter a clue or pattern or both:
The Clue
Book supplements (7 letter answer)
The Answer
ADDENDA
Tags
Notes
The answer ADDENDA is seen occasionally, appearing about once every 750 puzzles.
Related Clues
Afterthoughts
Appendices
Appendixes
Extras
Riders
Supplements
Book appendixes
Book ends?
Dictionary section
Supplemental material
Supplementary material
Tack-ons
Back-of-the-book list
End-of-book matter
Extra pages, say
Last-minute writings
Definition
ADDENDUM as a noun:
1. (addendum, supplement, postscript) = textual matter that is added onto a publication; usually at the end