diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7710a7b0..342362aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - When using a rule with hour_of_day validations, and asking for occurrences on the day that DST skips forward, valid occurrences would be missed. ([#464](https://github.com/seejohnrun/ice_cube/pull/464)) by [@jakebrady5](https://github.com/jakebrady5)
 - Include `exrules` when exporting a schedule to YAML, JSON or a Hash. ([#519](https://github.com/ice-cube-ruby/ice_cube/pull/519)) by [@pacso](https://github.com/pacso)
 - Documentation links updated to point to the new repository location. ([#553](https://github.com/ice-cube-ruby/ice_cube/pull/553)) by [@pacso](https://github.com/pacso)
+- Input validation added for day_of_week validator. Fixes infinite loops when invalid day_of_week occurrences are provided. ([#554](https://github.com/ice-cube-ruby/ice_cube/pull/554)) by [@pacso](https://github.com/pacso)
 
 ## [0.16.4] - 2021-10-21
 ### Added