Postscript
/pˈoʊˌskrɪpt/
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Definition
(noun) An addendum to a letter, added after the author's signature.
Sentence Examples
Clearly, Lojban is easier than Postscript.
The postscript for good intentions is: next time.
CEFR Practice Quiz
She added a brief ____ to the letter mentioning that she had just heard the good news.