Changelog
A changelog is a chronological record of notable changes between versions or releases of a product, library, plugin, or project.
It exists so users and maintainers can quickly see what changed, when it changed, and why it may matter.
What it does
A changelog communicates release history in a structured way.
It is commonly used to:
- Summarize changes in each release
- Highlight bug fixes, features, and breaking changes
- Help users decide whether to update
- Support troubleshooting and upgrade planning
- Provide historical release context
Core concepts
Release-oriented history
A changelog is typically organized by release or version.
That makes it different from a raw commit history, which is usually too noisy for most users.
Notable changes only
A good changelog focuses on changes that matter to users, maintainers, or integrators.
It is not meant to document every tiny internal edit.
Upgrade communication
Changelogs become especially important when releases include migration steps, compatibility changes, or breaking changes.
Common use cases
- Plugin and library releases
- Product update notes
- Upgrade planning
- Support and debugging
- Internal release communication
Practical notes
- A changelog is most useful when it is human-readable and clearly grouped by release.
- Good changelogs call out new features, fixes, deprecations, and breaking changes explicitly.
- A raw Git log is not a substitute for a good changelog.
- Changelog quality has a direct impact on how safely users can upgrade.
Sources Used
Frequently Asked Questions
Is a changelog the same as commit history?
No. A changelog is a curated summary of user-relevant changes, while commit history is a low-level development record.
Why are changelogs important?
Because they help users and maintainers understand release impact, upgrade risk, and what changed.
Should breaking changes appear in the changelog?
Yes. Breaking changes should be clearly called out.