diff --git a/CHANGELOG.md b/CHANGELOG.md
index b25bf208..81fb05f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 Features (notes)
 - optimize recursive functions using C iteration
 - combine lambda functions that are only called for side effects.
+- improve inlining of primitives that work with immutable objects.
 
 Bug Fixes