diff --git a/Dart.gitignore b/Dart.gitignore
index 602616ce808aeffda5165d62d896f539cf266bca..74a3439f87b85a56066ea18e0cb1b679a3e15d48 100644
--- a/Dart.gitignore
+++ b/Dart.gitignore
@@ -1,11 +1,13 @@
-# Don’t commit the following files and directories created by pub and dart2js
+# Don’t commit the following directories created by pub.
+build/
 packages/
+
+# Or the files created by dart2js.
+*.dart.js
+*.dart.precompiled.js
 *.js_
 *.js.deps
 *.js.map
 
-# Include when developing application packages
+# Include when developing application packages.
 pubspec.lock
-
-# Avoid committing generated JavaScript files
-*.dart.js