addendum; supplement; appendix;
an addition at the end of a book or report.
I added a codicil to the back of my report. It says where I found the information.
codicil reminds of "co" "dictionary".
dictionary reminds of words.
we add more words.
I will add a codicil to the contract that will say when the job will be done.
(c) 2016 E. Carruthers