diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0be52447..9cf282ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ Unreleased
 ### Bug fixes
 - [#507](https://github.com/peggyjs/peggy/pull/507) Remove stray semicolon in CSS
 - [#508](https://github.com/peggyjs/peggy/pull/508) Fix broken text input
+- [#520](https://github.com/peggyjs/peggy/pull/520) Grammar with token "constructor" fails to generate
 
 ### Documentation
 - [#506](https://github.com/peggyjs/peggy/pull/506) Added END OF INPUT (`!.`).