diff --git a/CHANGELOG.md b/CHANGELOG.md
index 48c6a38..7db04e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Added `CcsdsPacketCreator`, `CcsdsPacketReader` and `CcsdsPacketCreatorWithReservedData`
   which simplify the process of creating full CCSDS space packets.
+- Added new optional `portable-atomic` because portable atomics might not work on every
+  architecture in addition to requiring atomic CAS support enabled inside for the crate.
 
 # [v0.16.1] 2025-09-26