The difference between a PR that gets merged in hours and one that languishes for weeks often comes down to the description. Not the code—the words around it.

I've submitted hundreds of PRs to open-source projects. Some flew through review. Others stalled, accumulated "needs clarification" comments, and died slow deaths in the "awaiting response" graveyard. The difference wasn't code quality. It was how well I explained what I was doing and why.

Here's what I've learned about writing PR descriptions that actually work.

Why PR Descriptions Matter

A PR description isn't bureaucracy. It's communication infrastructure.

Reviewers Are Busy

The maintainer reviewing your code has limited time and cognitive bandwidth. They're probably reviewing multiple PRs while also writing their own code, responding to issues, and occasionally sleeping.

A good description respects their time. It answers questions before they're asked. It provides context they'd otherwise have to hunt for. It makes the reviewer's job easier—which means your code gets reviewed faster.

A bad description forces reviewers to work harder. They have to read every line of code to figure out what you're trying to accomplish. They have to guess at your reasoning. They have to ask clarifying questions and wait for responses. Each round-trip adds days.

Documentation for Future You

Six months from now, someone will look at this change and ask "why did we do this?" That someone might be you.

PR descriptions are archaeological records. They capture the context that made a decision make sense at the time. They explain trade-offs that aren't obvious from the code alone. They link to the issues, discussions, and resources that informed the approach.

Code comments explain what and how. PR descriptions explain why and why not.

They Show Professionalism

In open source, your PR description is often your introduction. Maintainers don't know you. They're evaluating whether to trust your judgment based on a few paragraphs of text and some code.

A thoughtful PR description signals that you've thought carefully about the change. It shows you respect the project and its maintainers. It demonstrates that you can communicate clearly—a skill as important as coding.

First impressions matter. Make yours count.

What to Include

Every good PR description answers four questions: What changed? Why did it change? How can I verify it works? What does it look like?

Context: Why This Change?

Start with the problem, not the solution.

Bad:

Added validation to the user input form.

Good:

Users were able to submit the form with empty email fields, causing null pointer exceptions in the notification service (fixes #342). This adds client-side validation to catch empty fields before submission.

The second version tells reviewers:

  • What problem existed
  • What impact it had
  • How this PR addresses it
  • Where to find more context (issue #342)

Context also includes scope boundaries. What does this PR not do?

Note: This adds client-side validation only. Server-side validation is tracked in #343 and will be a separate PR.

Reviewers often ask "why didn't you also do X?" Preempt that question by explaining what's deliberately out of scope.

What Changed: The Actual Diff

Describe what you modified and how. This section helps reviewers know what to look for.

Changes:

  • Added validateEmail() function in src/utils/validation.ts
  • Updated UserForm component to call validation on blur
  • Added error state styling to form inputs
  • Added unit tests for validation logic

For larger PRs, organize by area:

Backend changes:

  • New POST /api/validate endpoint for async validation
  • Rate limiting middleware to prevent abuse

Frontend changes:

  • Form component now debounces input before validation
  • Error messages display inline below fields

Tests:

  • Unit tests for validation endpoint
  • Integration tests for rate limiting
  • E2E tests for form submission flow

This structure helps reviewers split the work. "I'll review the backend, you take frontend."

How to Test: Prove It Works

Tell reviewers exactly how to verify your change works. Don't make them figure it out.

Testing instructions:

  1. Check out this branch
  2. Run npm install (new dev dependency)
  3. Start the dev server with npm run dev
  4. Navigate to /signup
  5. Try submitting with an empty email field — should see error message
  6. Try submitting with invalid email (e.g., "notanemail") — should see error
  7. Try submitting with valid email — should succeed

Be specific. Include exact commands. Mention if there are new dependencies or database migrations. Assume the reviewer has never touched this part of the codebase.

For bug fixes, include steps to reproduce the original bug:

To reproduce the original bug:

  1. Navigate to /settings
  2. Click "Export Data" with no data present
  3. Observe: page crashes with "Cannot read property 'map' of undefined"

After this fix: Same steps should show "No data to export" message instead.

Screenshots and Visuals

If your change affects UI, show it. A screenshot is worth a thousand words of description.

Include:

  • Before and after comparisons for visual changes
  • GIFs for interaction changes (loading states, animations)
  • Screenshots of error states, not just happy paths
  • Mobile views if responsive design is involved

Format them clearly:

Before:

After:

For non-UI changes, consider other visuals:

  • Diagrams for architecture changes
  • Flame graphs for performance improvements
  • Log output comparisons for debugging changes

Visuals reduce cognitive load. Use them.

Templates That Work

Here's the template I use for most PRs:

## Summary
[One paragraph explaining what this PR does and why]
 
## Related Issues
Fixes #123
Related to #456
 
## Changes
- [List of specific changes]
- [Organized by area for larger PRs]
 
## How to Test
1. [Step-by-step instructions]
2. [Include commands to run]
3. [Describe expected behavior]
 
## Screenshots
[If applicable]
 
## Notes for Reviewers
[Optional: call out tricky parts, ask specific questions, explain non-obvious decisions]

For bug fixes, I add a section:

## Bug Description
[What was happening]
 
## Root Cause
[Why it was happening]
 
## Fix
[How this PR addresses it]

For features:

## User Story
As a [user type], I want [goal] so that [benefit].
 
## Acceptance Criteria
- [ ] [Criterion 1]
- [ ] [Criterion 2]

Adapt these to the project's existing conventions. If they have a PR template, use it. Consistency helps maintainers process PRs faster.

Common Mistakes

Too Short

The most common problem. PR descriptions that say nothing:

"Fixed bug" "Updated styles" "WIP" "Addressing review comments"

These descriptions waste everyone's time. Reviewers have to guess what you did. Future developers have no context. The PR history becomes useless as documentation.

Even small changes deserve context. "Fixed typo in error message: 'recieve' → 'receive'" tells the full story in one line. No guessing required.

No Context

Starting with the solution instead of the problem:

"This PR adds a caching layer for database queries."

Compare to:

"Database queries in the dashboard are taking 3+ seconds, causing users to think the page is frozen. This adds a caching layer that brings query time down to ~100ms for repeated views."

The second version tells reviewers why they should care. It establishes stakes. It makes the technical change meaningful.

No Testing Instructions

Assuming reviewers will figure out how to test your change is a rookie mistake.

I've seen PRs to complex projects with no setup instructions, no mention of required environment variables, no explanation of which page to visit or which button to click. The reviewer has to reverse-engineer the testing process from the code diff.

Most won't bother. Your PR sits in limbo until you respond to "how do I test this?" comments. Round-trip time: days.

Write the testing instructions. Even if they seem obvious. Especially if they seem obvious.

Missing Error Cases

Showing only the happy path:

Screenshot: Form successfully submitted

What about:

  • Form with validation errors?
  • Form during submission (loading state)?
  • Form after network failure?

Reviewers want to know you've thought about edge cases. Show that you have. Include screenshots of error states, empty states, and failure modes.

Assuming Knowledge

Writing for yourself instead of your audience:

"Updated the thing we discussed in standup to work with the new architecture."

What thing? Which standup? What architecture? Anyone not in that conversation is lost.

PR descriptions should stand alone. Someone reading them in a year should understand what happened without needing to have been in your planning meetings.

Link to discussions, issues, and documents. Spell out acronyms the first time. Assume your reader has context about the codebase but not about your team's recent conversations.

The 2-Minute Investment

Writing a good PR description takes about two minutes. Maybe five for a complex change.

That investment saves hours of back-and-forth. It prevents misunderstandings. It makes your code easier to review, which means it gets reviewed. It builds trust with maintainers, which makes future contributions smoother.

Two minutes of writing. Hours of saved time. A reputation as someone who communicates well.

The code matters. But the description gets the code merged.

Write the PR description you'd want to receive as a reviewer. Explain the problem before the solution. Tell people how to test. Show, don't just tell.

Your future self—and every maintainer who reviews your code—will thank you.

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