diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0016ca0..9a65881a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,8 @@
 
 ### Added
 
-N/A
+- **aiken-lang**: numbers can now be written as hexadecimal digits (e.g. `0x42`)
+- **aiken-lang**: numbers can now be written using numeric underscores as separator (e.g. `1_000_000`)
 
 ### Fixed