Postscript (PS) Formatting
A postscript is an extra note added after the main letter or email. “PS” is a standard abbreviation, and “P.S.” is also recorded in American dictionary usage; choose punctuation consistently with your editorial style instead of inventing a universal rule.
Use PS for a short afterthought at the end of a letter or email—for example, “PS: I’ve attached the updated schedule.” Put important instructions in the main body instead of hiding them in a postscript.
Key details
Further guidance
Form
Cambridge records “PS” and the American-dictionary form “P.S.”, so punctuation should follow the style system you are using rather than being labeled universally right or wrong.
Function
Use a postscript for a short addition after the main message; it should not be a substitute for essential information that belongs in the body.
Placement
A postscript appears at the end of the letter or email, after the main message and closing/signature context.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Postscript — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Definition of postscript and PS as an added message after the main letter or email
- PS — Cambridge Dictionary (opens in a new tab)Cambridge University Press · PS/P.S. abbreviation and placement at the end of a letter or email