postscript

From Wiktionary

Pronunciation[change]

Noun[change]

Singular
postscript

Plural
postscripts

  1. (countable) A postscript is a message that is put at the end of a letter and is put after the author's signature.
    He added a postscript to the end of the letter.
  2. (countable) (literature) A postscript is something that is added to a story or play after it is finished.
    The author explained in the postscript of the book why she wrote the book.