diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a1ae8575..61038a1d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,7 +13,7 @@ more granular).
 
 Fixed a rare issue where single-item lists were flattened.
 
-## Diffing
+### Diffing
 
 Diff calculations are now greedier when syntax nodes are identical, making
 diffing significantly faster when most syntax nodes are the same.