diff --git a/packages/pigeon/CHANGELOG.md b/packages/pigeon/CHANGELOG.md
index 83f669b9cd..50cf3e5ebe 100644
--- a/packages/pigeon/CHANGELOG.md
+++ b/packages/pigeon/CHANGELOG.md
@@ -27,7 +27,7 @@
 
 ## 0.1.11
 
-* Added flag to generate null safety annotated Dart code `--dart-null-safety`.
+* Added flag to generate null safety annotated Dart code `--dart_null_safety`.
 * Made it so Dart API setup methods can take null.
 
 ## 0.1.10+1