postscript
🇺🇸
/ˈpəʊstskrɪpt/
🇬🇧
/ˈpəʊstskrɪpt/
A short message added at the end of a letter after you've already finished it and signed your name.
I forgot to tell you about the party in my letter, so I added a postscript.
Additional information or comments added after the main part of a book, article, or story has ended.
At the book's end, there's a postscript that gives updates about the characters' lives.