diff --git a/CHANGELOG.md b/CHANGELOG.md
index d0adbb76..bfb2ea57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@
 - **aiken-lang**: Added some optimization tests
 - **aiken-lang**: Added an Aiken to uplc conversion tests on validators
 - **aiken-lang**: Added some uplc builder functions for builtin creation
+- **aiken-lang**: Added optimization where identity functions called on an arg
+  are reduced to just the arg.
 
 ### Fixed