# Correction, revision or second edition?

> When a fix is a re-upload, when it needs a new ISBN, and what to do about the people who already bought the old one. The three cases, and the line between them.

Canonical: https://buk.press/blog/second-edition-of-a-book

14 September 2026 · 6 min read

A typo fix is a re-upload: same ISBN, same listing, nobody told. A meaningful revision that changes what the reader gets is a new edition: new ISBN, the words "Second Edition" on the cover, and a new record. The line is whether somebody who owns the old one would be misled by being sold it. If yes, it is a new edition.

Self-published books can be corrected in an afternoon, which is a genuine advantage over print publishing and creates a question print publishing never had to answer: at what point does fixing a book become publishing a different one?

## The three cases

|  | Correction | Revision | New edition |
|---|---|---|---|
| Example | Typos, a broken link, a bad image | A rewritten chapter, updated screenshots | New chapters, restructured, substantially updated |
| New ISBN | No | No | Yes |
| Cover changes | No | No | Yes: "Second Edition" |
| Store listing | Same | Same, description may need a line | New listing, or a new record |
| Tell existing buyers | No | Optional, and a nice touch | Yes |
| Reviews carry over | Yes | Yes | Usually not |

That last row is the reason not to declare a second edition lightly. A new ISBN generally means a new product record, and the reviews you spent a year accumulating stay with the old one.

## Where the line actually is

One test, and it is about the reader rather than the word count: **would somebody who owns the old version feel misled if they were sold this as the same book?** If the answer is yes, it is a new edition. If the answer is no, it is a correction, however many hours it took you.

- **Fixing forty typos**: a correction. Nobody bought the typos.
- **Updating six screenshots after an interface change**: a revision. The book does the same job, slightly better.
- **Adding two chapters and reordering the rest**: a new edition. Somebody who owns the old one is missing something real.
- **Rewriting a chapter that was wrong**: a revision, unless the error was central to the book's argument, in which case be honest and version it.
- **Changing the title**: a new record whatever else you did, because the ISBN is tied to the title.

## The ISBN question

An ISBN identifies a specific edition in a specific format. Correcting errors does not create a new edition; substantively changing the content does, and that requires a new ISBN. Changing format (the same words as an EPUB rather than a PDF, or as a paperback) also requires its own ISBN, which catches people out separately.

| Change | New ISBN? |
|---|---|
| Typos and small corrections | No |
| Updated content, same structure | No |
| Substantial new or rewritten content | Yes |
| New title or subtitle | Yes |
| Same book as EPUB instead of PDF | Yes, a different format |
| New cover only | No |
| New price | No |

If your book has no ISBN, none of this applies mechanically and the editorial judgement still does; [do you need an ISBN?](https://buk.press/blog/do-you-need-isbn) covers when the answer is genuinely no. Stores that assign their own identifier handle versioning through their own dashboards, which is simpler and gives you less control.

## How to push a correction

The mechanics are dull and worth getting right, because the failure mode is quiet: a fixed file on one store and the broken one still selling on three others.

1. **Fix it in the source, once.** Not in the exported file, but in the manuscript, so both exports agree and the fix survives the next export.
2. **Re-export the PDF and the EPUB together.** A book corrected in one format and not the other is worse than a book with a typo.
3. **Validate again.** EPUBCheck takes three seconds and catches the thing the edit broke: [EPUB validation errors](https://buk.press/blog/epub-validation-errors).
4. **Re-upload everywhere.** Every store, plus your own storefront, plus any download link in an email sequence. Keep the list of places written down; you will not remember all of them.
5. **Note what changed**, in a file next to the manuscript. In six months you will want to know which version somebody is quoting.

The reason this is a twenty-minute job rather than an afternoon is entirely about how the manuscript is stored. A book that lives as plain text re-exports both formats from the corrected source; a book that lives as a layout file means fixing it once per format and hoping they still match. [Self-publishing from Markdown](https://buk.press/blog/self-publish-from-markdown) is that argument in full, and correction is where it pays most obviously.

## What existing buyers get

This is the part with no universal answer, and the part readers feel strongest about.

- **Store buyers** are at the mercy of the store. Some push updated files to existing purchasers, sometimes only on request, and you generally cannot control it. Do not promise what the store decides.
- **Direct buyers are yours.** If you sell from your own storefront, you have their email address and can simply send the new file, which is the cheapest loyalty you will ever buy, and one more entry on the list in [where to sell your ebook](https://buk.press/blog/where-to-sell-your-ebook).
- **For a genuine second edition**, give existing direct buyers the new one free or at a steep discount. They paid for the book, not for the version number, and the goodwill is worth more than the handful of upgrade sales.
- **Say so in the email.** "Chapter 6 was wrong, here is the corrected file" earns more trust than silence does, and considerably more than being found out.

This is the strongest practical argument for selling direct alongside the stores. It is not only the margin. It is that you can still reach the people who bought the version with the mistake in it.

## What a second edition needs

If you have decided it is genuinely a new edition, do it properly. A half-declared edition confuses buyers and libraries and leaves you with two records that disagree.

- **"Second Edition" on the cover**, small, usually under the title.
- **A new ISBN**, and the old edition's record left in place rather than deleted.
- **The copyright page updated**: new edition, new year, and the first edition's year kept: [front and back matter](https://buk.press/blog/front-matter-and-back-matter).
- **A short preface saying what changed.** Half a page. Readers of the first edition want to know whether to buy again, and telling them plainly is what makes them trust the answer.
- **The description updated** to lead with what is new, because that is what the returning reader is scanning for: [how to write a book description](https://buk.press/blog/writing-a-book-description).
- **A decision about the old edition.** Leave it for sale at a lower price, or unpublish it. Both are defensible; leaving it at the same price is not.

## How often is too often

Corrections: as often as you find things, forever. There is no cost and no reader is harmed by a book that gets quietly better.

Editions: rarely. A book that reaches its fourth edition in two years signals a book that was published unfinished, and each edition resets the review count that was doing the selling. For a technical book that genuinely dates, every two to three years is a normal rhythm. For anything else, the second edition should be the one that arrives when the first has taught you something big enough to be worth the reset.

And the reason to be relaxed about the first category: a digital book is the only kind you can fix after shipping. Reviews that mention a typo can be answered by removing the typo, which is a thing no printed first run has ever been able to do. See [a book launch checklist](https://buk.press/blog/book-launch-checklist) for where in the schedule that correction pass belongs.

**About this article.** Written by the team that builds bukpress, which turns Markdown into print-ready PDF and EPUB books. Spotted something wrong or out of date? Write to [support@buk.press](mailto:support@buk.press).

## Read next

Explainers 30 August 2026 · 4 min read

## [Do you need an ISBN to self-publish a book?](https://buk.press/blog/do-you-need-isbn)

You need an ISBN to sell a printed book through most retailers and libraries. You do not need one to sell a PDF from your own website, and you do not need one for a Kindle ebook on Amazon KDP. If you use a free ISBN a platform assigns, that number is tied to that platform, so it cannot come with you if you also publish the same edition somewhere else.

[Read it](https://buk.press/blog/do-you-need-isbn)

Guides 12 September 2026 · 5 min read

## [A book launch checklist, from eight weeks out](https://buk.press/blog/book-launch-checklist)

Eight weeks out: finish the files, write the metadata, line up early readers. Four weeks: set up the store listings and the direct storefront, start telling people it is coming. Launch week: publish, email your list, ask for reviews. The month after: fix what the reviews found and keep selling: most self-published books earn more in month three than week one.

[Read it](https://buk.press/blog/book-launch-checklist)

Guides 4 September 2026 · 5 min read

## [How to deliver an ebook to the people who buy it](https://buk.press/blog/how-to-deliver-an-ebook-to-buyers)

Send a PDF and an EPUB together, delivered as a download link from a platform that handles payment and delivery in one step. Do not email attachments: they bounce on size and land in spam. Do not bother with DRM on a direct sale; it inconveniences honest buyers and stops nobody, and a personal note on the title page does more.

[Read it](https://buk.press/blog/how-to-deliver-an-ebook-to-buyers)

## Write it in Markdown. Ship a book.

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