diff --git a/CHANGELOG.md b/CHANGELOG.md
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+++ b/CHANGELOG.md
@@ -1,7 +1,18 @@
 # Changelog
+
+## Versioning
+
+CyberChef uses the [semver](https://semver.org/) system to manage versioning: MAJOR.MINOR.PATCH.
+
+- MAJOR version changes represent a significant change to the fundamental architecture of CyberChef and may (but don't always) make breaking changes that are not backwards compatible.
+- MINOR version changes usually mean the addition of new operations or reasonably significant new features.
+- PATCH versions are used for bug fixes and any other small tweaks that modify or improve existing capabilities.
+
 All major and minor version changes will be documented in this file. Details of patch-level version changes can be found in [commit messages](https://github.com/gchq/CyberChef/commits/master).
 
 
+## Details
+
 ### [9.23.0] - 2020-02-01
 - Various RSA operations added to encrypt, decrypt, sign, verify and generate keys [@mattnotmitt] | [#652]