diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba46b94d..af1d842f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,7 @@
 Released on May 25, 2019
 ([diff](https://github.com/haml/haml/compare/v5.1.0...v5.1.1)).
 
-* Fix NameError bug for that happens on ruby 2.6.1-2.6.3 + haml 5.1.0 + rails 4.2.x + erubi. (Akira Matsuda)
+* Fix NameError bug that happens on ruby 2.6.1-2.6.3 + haml 5.1.0 + rails < 5.1 + erubi. (Akira Matsuda)
 
 ## 5.1.0