diff --git a/CHANGELOG.md b/CHANGELOG.md
index 622b60ff..e50d487f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ Bug Fixes
 - Avoid compilation errors when a program ends with a `set!` expression. Thanks to Yorick Hardy for the bug report!
 - Fixed a bug with the interpreter such that running an `import` will no longer remove definitions from the global environment.
 - Fixed another interpreter bug to allow `import` to load renamed identifiers.
+- Prevent compiler errors when calling an anonymous lambda that accepts an optional argument list.
 
 ## 0.18 - June 8, 2020