noun
postscript
POHST-skript/ˈpəʊstskrɪpt/
A note added after the main text of a letter or other writing.
A postscript appears beneath the letter’s signature.

Etymology
The pieces mean “written after”: a postscript is an addition made after the main composition is finished. In a letter, it especially names the extra note following the writer's conclusion and signature.
In context
A postscript followed in the strangest contrast to the formal note--a postscript hasty and blotted, which had evidently been added
More examples
- The letter’s postscript contained the most important news.
- He included the address in a postscript.
- A brief postscript corrected the earlier date.
Forms
postscript · postscripts
Similar words
- addendum
- An addendum is supplementary material added to a document; a postscript is commonly a short note after a letter’s main text.
- afterword
- An afterword is a concluding section of a book; a postscript is usually a briefer appended note.