diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e8d327..da47d0d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - GitHub actions are limited to the `dev` and `main` branches
 - `countdown_timer` and `countup_timer` functions updated
 - `README.md` updated
+- `TONES.md` updated
 ## [1.8] - 2024-10-23
 ### Added
 - 5 new tones