diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71a74a27..21ab158d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ All notable changes to this project will be documented in this file.
 - Separates memory related traces to reduce verbosity of logging
 - Fixes output of PRAGMA cipher_integrity_check on big endian platforms
 - Cryptograpic provider interface cleanup
+- Rework of mutex allocation and management
 - Resolves miscellaneous build warnings
 
 ## [4.2.0] - (May 2019 - [4.2.0 changes])