diff --git a/lib/src/models/quill_delta.dart b/lib/src/models/quill_delta.dart
index 3cab1910..486e0b1a 100644
--- a/lib/src/models/quill_delta.dart
+++ b/lib/src/models/quill_delta.dart
@@ -1,10 +1,4 @@
-// Copyright (c) 2018, Anatoly Pulyaevskiy. All rights reserved. Use of this
-// source code is governed by a BSD-style license that can be found in the
-// LICENSE file.
-
 /// Implementation of Quill Delta format in Dart.
-library quill_delta;
-
 import 'dart:math' as math;
 
 import 'package:collection/collection.dart';
diff --git a/lib/src/utils/platform_helper.dart b/lib/src/utils/platform.dart
similarity index 100%
rename from lib/src/utils/platform_helper.dart
rename to lib/src/utils/platform.dart
diff --git a/lib/src/utils/string_helper.dart b/lib/src/utils/string.dart
similarity index 100%
rename from lib/src/utils/string_helper.dart
rename to lib/src/utils/string.dart
diff --git a/lib/src/widgets/cursor.dart b/lib/src/widgets/cursor.dart
index 12eeafc2..3fb190a0 100644
--- a/lib/src/widgets/cursor.dart
+++ b/lib/src/widgets/cursor.dart
@@ -2,7 +2,7 @@ import 'dart:async';
 
 import 'package:flutter/widgets.dart';
 
-import '../utils/platform_helper.dart';
+import '../utils/platform.dart';
 import 'box.dart';
 
 /// Style properties of editing cursor.
diff --git a/lib/src/widgets/default_styles.dart b/lib/src/widgets/default_styles.dart
index 19ba1f4b..15a5d4de 100644
--- a/lib/src/widgets/default_styles.dart
+++ b/lib/src/widgets/default_styles.dart
@@ -3,7 +3,7 @@ import 'package:tuple/tuple.dart';
 
 import '../../flutter_quill.dart';
 import '../models/documents/style.dart';
-import '../utils/platform_helper.dart';
+import '../utils/platform.dart';
 
 class QuillStyles extends InheritedWidget {
   const QuillStyles({
diff --git a/lib/src/widgets/editor.dart b/lib/src/widgets/editor.dart
index 4c8e5a73..a6eab01d 100644
--- a/lib/src/widgets/editor.dart
+++ b/lib/src/widgets/editor.dart
@@ -10,7 +10,7 @@ import 'package:flutter/services.dart';
 import '../models/documents/document.dart';
 import '../models/documents/nodes/container.dart' as container_node;
 import '../models/documents/nodes/line.dart';
-import '../utils/platform_helper.dart';
+import '../utils/platform.dart';
 import 'box.dart';
 import 'controller.dart';
 import 'cursor.dart';
diff --git a/lib/src/widgets/embeds/default_embed_builder.dart b/lib/src/widgets/embeds/default_embed_builder.dart
index 0832cb39..d3188507 100644
--- a/lib/src/widgets/embeds/default_embed_builder.dart
+++ b/lib/src/widgets/embeds/default_embed_builder.dart
@@ -4,8 +4,8 @@ import 'package:gallery_saver/gallery_saver.dart';
 
 import '../../models/documents/nodes/leaf.dart' as leaf;
 import '../../translations/toolbar.i18n.dart';
-import '../../utils/platform_helper.dart';
-import '../../utils/string_helper.dart';
+import '../../utils/platform.dart';
+import '../../utils/string.dart';
 import 'image.dart';
 import 'video_app.dart';
 import 'youtube_video_app.dart';
diff --git a/lib/src/widgets/raw_editor.dart b/lib/src/widgets/raw_editor.dart
index 02f13474..9919b2ea 100644
--- a/lib/src/widgets/raw_editor.dart
+++ b/lib/src/widgets/raw_editor.dart
@@ -17,7 +17,7 @@ import '../models/documents/document.dart';
 import '../models/documents/nodes/block.dart';
 import '../models/documents/nodes/line.dart';
 import '../models/documents/nodes/node.dart';
-import '../utils/platform_helper.dart';
+import '../utils/platform.dart';
 import 'controller.dart';
 import 'cursor.dart';
 import 'default_styles.dart';
diff --git a/lib/src/widgets/text_line.dart b/lib/src/widgets/text_line.dart
index 251c3f9f..73dc21f9 100644
--- a/lib/src/widgets/text_line.dart
+++ b/lib/src/widgets/text_line.dart
@@ -15,7 +15,7 @@ import '../models/documents/nodes/line.dart';
 import '../models/documents/nodes/node.dart';
 import '../models/documents/style.dart';
 import '../utils/color.dart';
-import '../utils/platform_helper.dart';
+import '../utils/platform.dart';
 import 'box.dart';
 import 'cursor.dart';
 import 'delegate.dart';
diff --git a/lib/src/widgets/toolbar/image_video_utils.dart b/lib/src/widgets/toolbar/image_video_utils.dart
index f4673e59..a19cabe3 100644
--- a/lib/src/widgets/toolbar/image_video_utils.dart
+++ b/lib/src/widgets/toolbar/image_video_utils.dart
@@ -6,7 +6,7 @@ import 'package:image_picker/image_picker.dart';
 
 import '../../models/documents/nodes/embed.dart';
 import '../../translations/toolbar.i18n.dart';
-import '../../utils/platform_helper.dart';
+import '../../utils/platform.dart';
 import '../controller.dart';
 import '../toolbar.dart';