diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 7e1ad53a..f75b9cc4 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -21,6 +21,7 @@ dependencies:
   zeta_flutter:
     path: ../
 
+  collection: any
 dev_dependencies:
   flutter_test:
     sdk: flutter
diff --git a/lib/src/theme/theme_service.dart b/lib/src/theme/theme_service.dart
index 7e787794..57e3d3cc 100644
--- a/lib/src/theme/theme_service.dart
+++ b/lib/src/theme/theme_service.dart
@@ -6,7 +6,7 @@ import 'contrast.dart';
 const String _kThemeMode = 'themeMode';
 const String _kContrast = 'contrast';
 const String _kColor = 'color';
-//TODO(thelukewalton): Revert this to include color also?
+// TODO(thelukewalton): Revert this to include color also?
 
 /// `ZetaThemeService` is an abstract class.
 /// It provides the structure for loading and saving themes in Zeta application.