diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6ec5b2..dae0444 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Bugs fixed in this release
 
+- Some methods in date- and time-related utilities, which took instances of `CultureInfo` or `DateTimeFormatInfo` as parameters, did not check for `null` arguments. This has been fixed and `ArgumentNullException` is now thrown when needed.
+
 ### Known problems introduced by this release
 
 ## [1.0.170-preview](https://github.com/Tenacom/Louis/releases/tag/1.0.170-preview) (2023-09-26)