diff --git a/travis/test.sh b/travis/test.sh
index 4043ec54b41..b5ef97401e7 100755
--- a/travis/test.sh
+++ b/travis/test.sh
@@ -6,6 +6,10 @@ export PATH="$PWD/bin:$PATH"
 # analyze all the Dart code in the repo
 flutter analyze --flutter-repo --no-current-directory --no-current-package --congratulate
 
+# keep the rest of this file in sync with
+# //chrome_infra/build/scripts/slave/recipes/flutter/flutter.py
+# see https://github.com/flutter/flutter/blob/master/infra/README.md
+
 (cd packages/cassowary; dart -c test/all.dart)
 (cd packages/flutter; flutter test)
 (cd packages/flutter_driver; dart -c test/all.dart)