1) Afterthoughts 2) Appendices 3) Appendix 4) Appendixes 5) Bill riders 6) Book additions 7) Book appendixes 8) Book ends 9) Book supplement 10) Contract extras 11) Contract riders 12) Dictionary section 13) Extra pages 14) Extras 15) Last-minute entries 16) Postscripts 17) Postscripts of a sort 18) Postscripts, supplements 
• (pl. ) of Addendum
addenda (uh DEN duh) (plural) Things to be added, as in a supplement or an appendix: 'The author included an addenda of new materials in his book.'
a pl. of · a list of things to be added: The addenda in the back of the book runs to thirty pages.