diff --git a/Dart.gitignore b/Dart.gitignore
index 4d2a4d6..58950be 100644
--- a/Dart.gitignore
+++ b/Dart.gitignore
@@ -1,12 +1,13 @@
 # See https://www.dartlang.org/tools/private-files.html
 
 # Files and directories created by pub
+.dart_tool/
 .packages
 .pub/
 build/
 # If you're building an application, you may want to check-in your pubspec.lock
 pubspec.lock
 
 # Directory created by dartdoc
 # If you don't generate documentation locally you can remove this line.
 doc/api/