diff --git a/CHANGELOG.md b/CHANGELOG.md
index d6ccca2..9b4e8e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - `Primer` class
 - Molecular weight calculation
 - Sequence validation
+- Unit tests
 - `complement` method
 - `reverse` method