How to Write Cleaner Code Comments and Commit Messages Like a Pro

Why Your Comments and Commits Matter More Than You Think

As developers, we often focus on writing clean, efficient code but neglect the words surrounding it. Yet those words—code comments, commit messages, pull request descriptions—are what hold teams together. They prevent midnight fire drills, speed up onboarding, and turn a solitary craft into a collaborative endeavor. A well-written comment can save hours of head-scratching; a cryptic commit message can trigger a cascade of "why did we do this?" questions.

But writing well is hard, especially when you're deep in a codebase. You might second-guess your grammar, over-explain, or default to vague placeholders like "fix bug." Fortunately, a blend of solid practices and modern writing tools can elevate your developer communication without slowing you down. In this guide, we'll walk through practical tips for cleaner code comments and commit messages, and explore tools—including Lint—that integrate directly into your workflow.

The High Cost of Bad Developer Writing

Before diving into solutions, let's look at what's at stake:

- Wasted debugging time: A confusing comment can mislead a developer trying to fix a bug, turning a 5-minute task into an hour-long investigation.
- Knowledge silos: Poor documentation hoards context in one person's head. When they leave, their tribal knowledge leaves with them.
- Merge slowdowns: Vague pull request descriptions force reviewers to guess intent, extending review cycles.
- Morale erosion: Endless "WTF does this do?" moments sap team morale and trust.

Clear writing is a force multiplier. It's not about pedantic grammar; it's about transmitting intent precisely.

Common Pitfalls in Developer Writing

Most developers fall into these traps:

- Redundant comments: // Increment i by 1 above i++ adds zero value.
- Outdated comments: Refactoring code without updating the comment creates misinformation.
- Vague commit messages: "Update file" or "Changes" leaves no trace of why something happened.
- Jargon overload: Using acronyms that only half the team understands.
- No context: A comment like "Check for edge case" without explaining *which* edge case.

The antidote is a mix of discipline and tooling.

Best Practices for Code Comments

Comment Why, Not What

Your code should be self-documenting for the *what*. Comments should explain the *why*—the business logic, the workaround for a library bug, the reason a non-obvious algorithm was chosen.

Bad: // Set x to 5
Good: // Default timeout is 5s because the external API consistently responds within 2s; timeout >2s avoids retry storms

Keep Comments Current

Treat comments as part of the codebase. When a function signature changes, update its documentation block. Outdated comments are worse than none.

Use Consistent Style

Adopt a team standard: do you use JSDoc, JavaDoc, or inline # comments? Linters for comments can help enforce consistency.

Avoid Noise

Delete commented-out code unless it has a clear purpose (like a future feature flag). It rots and creates confusion.

Best Practices for Commit Messages

The git commit message is a permanent record of your project's evolution. A great message follows a simple template:

``
():




`

Examples:
- fix(auth): correct token refresh on 401 response
- feat(parser): add support for JSON5
- docs(api): update rate limit description

The 50/72 Rule

Many projects follow this convention:
- Subject line: 50 characters max (imperative mood, no period at end)
- Body: wrapped at 72 characters, providing context.

Write for a Blame Reader

Imagine someone running git blame two years from now. Will they immediately know *why* a change was made? Include links to issues, design documents, or discussion threads.

Avoid Vague Verbs

Words like "fix," "update," and "change" often hide the real action. Prefer specific verbs: "correct," "add," "remove," "refactor."

Tools That Make Developer Writing Easier

Adhering to these practices manually takes mental energy. That's where writing assistant tools come in. Here's a look at popular options, including how they fit into a developer's toolkit:

| Tool | Best For | Developer-Specific Features | Free Tier Available | IDE Integration |
|----------------|------------------------------------|-----------------------------------------------------|----------------------|------------------|
| Grammarly | General English correctness | Browser extension, limited technical context awareness | Yes (basic) | Via browser/API |
| Hemingway | Simplifying dense prose | Highlights complex sentences, passive voice | Yes (web app) | No |
| Lint | Context-aware writing for devs | Scans comments, commits, docs inside VS Code; respects code syntax | Yes (core features) | Native VS Code extension |
| write-good | Lightweight prose linting | CLI tool, integrates with CI; marks "weasel words" and passive voice | Yes (open source) | Via CLI/editor plugins |
| alex | Inclusive language checking | CLI, can run on markdown; flags insensitive terms | Yes (open source) | Via CLI/CI |

A Closer Look at Lint

While tools like Grammarly excel at formal English, they can stumble on code-mixed text—flagging function names as typos or misunderstanding markdown syntax. Lint was built specifically for developers. It runs as a VS Code extension that scans your comments, commit messages, markdown files, and even string literals for spelling, grammar, and clarity issues, all while respecting the structure of your code. For instance, it knows not to lint inside a code block or a console.log statement.

Lint also offers team style guides: you can enforce rules like "always use imperative mood in commit messages" or "avoid passive voice in code comments." It's one option among many, but it fills a niche that general-purpose tools miss.

Setting Up a Writing Quality Pipeline

You can combine tools to create a layered defense against sloppy text:

Local editor: Install Lint or a similar real-time checker to catch issues as you type.

Pre-commit hooks: Use a linter like write-good or commitlint to enforce commit message standards.




CI/CD: Add alex or a spell checker to your pipeline so that documentation PRs can't merge with insensitive language or typos.

Team review: Still, nothing replaces human review for nuance and technical accuracy.

Practical Exercise: Rewriting a Bad Comment

Let's apply these ideas. Consider this original comment:
`js
// check the thing and if wrong fix it
function process(data) { ... }
`

After applying best practices and a tool like Lint (which would flag vagueness and informal tone), we get:
`js
/**
* Validates user input against the schema and sanitizes SQL injection attempts.
* We intentionally use a deno list because the legacy system passes array-like objects.
* @see https://teamwiki.example.com/validation-upgrade
*/
function process(data) { ... }
``

The diff tells a story. The reader now understands the "why" and where to find more context.

Overcoming Resistance to Writing

Some developers view writing as a distraction from coding. But consider the analogy of a clean workspace: a tidy desk reduces cognitive load. Clear commits and comments reduce the brain cycles spent reconstructing intent, allowing you to stay in flow. With tools that run seamlessly in your editor, the overhead is minimal—often just a click to accept a suggestion.

Moving Toward a Writing Culture

Improving your team's writing isn't a one-person mission. Start small: introduce a commit message template, then adopt a linter, then hold occasional brown-bag sessions on documentation. Recognize that writing, like code, benefits from iteration and review.

Conclusion

Clean code comments and commit messages are a mark of a senior developer. They demonstrate empathy for your teammates (including your future self) and a commitment to project longevity. By combining proven practices with developer-centric tools like Lint, you can turn writing from a chore into a natural part of your workflow. Next time you save a file or make a commit, take an extra moment to refine the words—your team will notice.

*What's your biggest struggle with developer writing? Share in the comments or experiment with a tool this week and see the difference.*