What Is Post Script? | Email And Letter Signoff Rules

You’ve finished the message. You’ve signed your name. Then you spot one more thing you wish you’d said. A post script is the place for that last line.

This guide breaks down what a post script is, where it fits, and how to use it without making your writing feel scattered.

What Is Post Script? In Emails And Letters

In plain terms, a post script is an add-on that sits after the sign-off and signature. In handwritten or typed letters, it appears below your name. In emails, it appears after your closing line and any typed signature block.

The usual label is “P.S.”, short for “postscript.” A standard definition describes it as a note appended after a letter or other finished writing, and “PS” is treated as the common abbreviation. You’ll see both in modern writing, so your goal is clarity, not perfection.

When A Post Script Makes Sense

A good P.S. earns its spot. It isn’t a dumping ground for random thoughts. It works best when it adds one clean, self-contained point the reader can grab in a glance.

Where You’ll See It	What The P.S. Can Do	Best Practice
Handwritten thank-you note	Add a final personal detail	Keep it warm and specific
Note to a teacher	Add one clarifier about the student	Keep the tone respectful
Work email to a colleague	Surface a quick reminder	Use one sentence, then stop
Newsletter email	Point to one next step	Write it like a real note, not a trick
Invitation or card	Add one practical detail	Put dates, times, and links in the main text
Job application letter	Flag one extra credential	Only if it fits the role’s tone
Printed memo	Add a short follow-up line	Don’t hide rules here
Essay or long article	Add a brief after-note	Use “Afterword” if the add-on runs long
Personal email to a friend	Add a friendly aside	Keep it short and genuine

The pattern is simple: a post script works best when it acts like a tiny spotlight. It calls attention to one final point, then gets out of the way.

Why People Still Read The P.S. Line

Readers scan. A P.S. sits in a predictable place, so eyes land on it fast. That makes it handy for reminders, last-minute clarifiers, and gentle nudges.

Three Smart Uses

• You caught a small omission: a missing link, a time, a name, a quick “thanks.”
• You want to stress one takeaway: a date to watch, a single action step, a short reminder.
• You want a personal touch: a detail that shows you paid attention.

Post Script Vs PostScript

One common confusion is the spelling. “Post script” and “postscript” refer to the after-note in a letter or message. “PostScript” with a capital S is also the name of a page description language used in printing and typesetting.

If your search brought you here because you saw “P.S.” at the end of an email, you’re in the right place. If you meant the printing language, you’re looking for a tech topic, not the writing habit.

How To Write A Post Script That Feels Natural

Start with a blunt question: does the main message still stand without this line? If the answer is yes, a P.S. can work. If the answer is no, you don’t need a post script—you need to edit the body.

Keep the content tight. One sentence is often enough. Two short sentences can work if they belong together. Past that, it stops being a post script and starts being a second message.

Before you hit send, glance at the last three lines as a mini unit: closing, name, P.S. If the rhythm feels odd, it will feel odd to the reader too often. A quick reread catches slips like a missing period, a space, or a P.S. that repeats the subject line.

Simple P.S. Patterns That Read Clean

• Reminder: “P.S. The meeting room changed to 3B.”
• Last detail: “P.S. I’ll bring the printed forms.”
• Personal note: “P.S. I loved your point about student feedback.”
• Single next step: “P.S. Reply by Friday if you’d like a seat saved.”

Post Script Meaning In Modern Writing

Outside letters, “postscript” can mean any after-note added once the main text is finished. Think of a short update after an article is drafted, or a final line added to a printed announcement after the main copy is set.

If you want a clean reference definition, the Merriam-Webster definition of postscript is a solid place to check when you’re verifying the term for a class or lesson plan.

P.S. Formatting Rules People Debate

Some writers swear by “P.S.” with periods. Others use “PS” without them. Both appear in published writing, and your choice can match your style guide, workplace norm, or personal preference.

The bigger rule is consistency. Pick a format and stick with it inside the same document or email thread.

Punctuation And Spacing

• Write “P.S.” or “PS” at the start of the line.
• Add a space after it, then your note.
• A colon can work in formal letters: “P.S.: Please attach the form.”
• Don’t stack commas or extra dots. One clean label is enough.

Capitalization

Most people capitalize the letters: P.S. or PS. Lowercase “ps” can look like a typo in formal writing. In casual chat, it can be fine.

Should You Use PPS?

“P.P.S.” is used when the writer adds a second after-note. Many readers recognize it right away. Still, if you’re writing something formal, a second postscript can make the message feel thrown together.

Using P.S. In Email Without Sounding Pushy

Email is where P.S. gets abused. The line looks small, so some writers use it to sneak in a demand, a guilt trip, or a sales hook. Readers notice. It can backfire fast.

A good email P.S. feels like a small extra, not a hidden agenda. If you’re adding a request, keep it polite and direct, and keep it aligned with the rest of the email.

Email P.S. Examples That Stay Polite

• P.S. If you need the slides again, I can resend the file.
• P.S. If the deadline shifts, tell me and I’ll adjust.
• P.S. Thanks again for the quick turnaround on this.

If you want a second reference, the Cambridge Dictionary entry for postscript describes it as a short message added after you’ve signed your name.

One Line Is Plenty

In email, a long P.S. can look like you buried the real message at the end. If you need three sentences, add a short paragraph above your closing instead.

Using P.S. In A Letter

In letters, a post script is familiar and widely accepted. A thank-you card can carry a playful P.S. A job application letter may not.

If you’re writing a formal letter, use a P.S. only when it adds a small clarifier you can’t easily weave into the main text without retyping the page. If rewriting is easy, rewrite.

Where It Goes On The Page

• Write your closing and signature first.
• Leave a blank line.
• Start the next line with P.S. and your note.

Handwritten Notes

Handwritten P.S. lines can feel charming because they look spontaneous. Keep the handwriting legible and the thought complete. A half-finished scribble reads like you ran out of space, not like you meant to add a final touch.

Common Mistakes That Make A P.S. Look Sloppy

A post script is short, so mistakes stand out. The fixes are simple once you know what to watch for.

Too Much New Information

If the P.S. carries the main point, your message is out of order. Shift that line into the body and make it part of the flow.

Stacking PPS, PPPS, And More

People add “P.P.S.” when they add a second after-note. It’s a real habit, and most readers understand it. Still, once you hit a chain, it looks like you didn’t plan your message.

If you’re tempted to write what is post script? again at the end as a joke, skip it. A P.S. isn’t a punchline; it’s a writing tool.

Using It To Hide Bad News

Don’t tuck a fee, a policy change, or a hard deadline in a P.S. Put that in the main body, in plain sight. Readers feel tricked when the post script carries the sting.

Alternatives When You Don’t Want A P.S.

Sometimes the clean move is to skip a post script. If you want the message to read smoothly from top to bottom, these options work well.

Alternative	Best Use	When To Skip
Add one short sentence in the body	Minor detail that fits naturally	It breaks the main point into fragments
Edit the closing line	Quick reminder tied to your sign-off	The closing becomes long and stiff
Use a subject line update	Email threads where priorities change	It confuses the thread topic
Add a “Note:” line above the signature	Work emails with a clear action step	The note reads like a warning label
Use an attachment label	Files that need a short pointer	The file name already says it
Add a footnote	Reports and academic writing	The note is too casual for a footnote
Add an afterword section	Long writing with a reflective add-on	You only need one short sentence
Send a follow-up email	When the new info changes the plan	The follow-up repeats the whole message

Quick Checklist Before You Add One

Use this scan to keep your post script clean.

• Is it one point that stands alone?
• Would the reader miss something big if it were deleted?
• Does it match the tone of the message?
• Is it short enough to read in one breath?
• Is the punctuation consistent with the rest of the writing?

Answering The Question People Usually Mean

Many searchers type what is post script? because they’ve seen “P.S.” and want to know what it’s doing there. It’s an after-note that lets the writer add one last line after signing.

Use it with restraint and it adds clarity and a human touch. Use it to cram in extra demands or late surprises and it reads like you didn’t respect the reader’s time.