diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d0fc96f..60c7f392 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,4 +10,12 @@
 # 0.2.0
 - support windows
 - nsis installer for windows
-- new example UI
\ No newline at end of file
+- new example UI
+
+# 0.4.0
+- use winit instead of glfw
+- use custom flutter engine builds
+- new cli tool `cargo-flutter`
+- refactor engine to be window framework agnostic
+- dropped tokio and libc dependencies
+- move plugins to `flutter-plugins`
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 0a5c65ad..0c2c7d0b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,29 +1,33 @@
 # Contributing guideline to flutter-rs
 
-Thank you for your interest in contributing to flutter-rs! We have many areas that could use some help.
-
-- Desktop intergration: We provide several plugins to intergrate with native desktop UI, such as clipboard, dialog... but more is needed.
-- Flutter Desktop GUI: Flutter is mainly for mobile. Desktop app need desktop widgets, such as context menu.
+Thank you for your interest in contributing to flutter-rs! We have many areas
+that could use some help.
+
+- Reporting and fixing platform specific bugs.
+- Desktop intergration: We provide several plugins to intergrate with native
+  desktop UI, such as clipboard, dialog... but more is needed.
+- Flutter Desktop GUI: Flutter is mainly for mobile. Desktop app need desktop
+  widgets, such as context menu.
 - Documentation.
 
 ## Structure
 This project is cargo workspace with multiple targets.
 
-- `flutter-engine` is the library that make flutter run. It create a window using glfw and provide MethodChannel struct to iterop with flutter/dart. It also provide an async runtime using tokio.
-
-    When an engine instance is run, a `platform_message_callback` is pass to flutter engine using C ffi. A registry is also created to listen to flutter MethodChannel calls. Various plugins is registered with the registry using `add_plugin` method. Later, when flutter request native implementation using `MethodChannel`, the callback previously passed as `platform_message_callback` is called, which select one plugin in the registry to handle the message.
-
-- `flutter-engine-sys` is the crate for ffi with flutter engine C apis. It generate bindings using bindgen automaticly.
-
-- `flutter-app-demo` is a demo project that showcase various features of flutter-rs.
-    - `flutter-app-demo/lib`: Dart code to create demo UI.
-    - `flutter-app-demo/rust`: Rust code that uses flutter-engine to to start a flutter runtime.
+- `flutter-winit` creates an event loop and a window and interfaces with the
+  `flutter-engine` crate.
 
-- `flutter-download` is used by cargo to download libflutter at build time.
+- `flutter-engine` is the library that make flutter run. It provides a
+  `MethodChannel` struct to iterop with flutter and dart.
 
-- `www` folder is various github website assets.
+    When an engine instance is run, a `platform_message_callback` is passed to
+    flutter engine using C ffi. A registry listens to flutter `MethodChannel`
+    calls. Various plugins are registered with the registry using the `add_plugin`
+    method. When flutter makes a native platform request, the callback is called
+    and processed by a registered plugin.
 
+- `flutter-engine-sys` is the crate for ffi with flutter engine C apis. It
+  generates bindings using bindgen.
 
 ## Reference
 - [Custom-Flutter-Engine-Embedders](https://github.com/flutter/flutter/wiki/Custom-Flutter-Engine-Embedders)
-- [Desktop Embedding for Flutter](https://github.com/google/flutter-desktop-embedding)
\ No newline at end of file
+- [Desktop Embedding for Flutter](https://github.com/google/flutter-desktop-embedding)
diff --git a/README.md b/README.md
index a5e1238a..8a81f655 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 
 Build flutter desktop app in dart & rust.
 
-![demo ui](https://raw.githubusercontent.com/flutter-rs/flutter-rs/master/www/images/demo_ui.png "Flutter app demo screenshot")
+![flutter-app-template][flutter-app-template]
 
 # Get Started
 
@@ -28,7 +28,7 @@ Build flutter desktop app in dart & rust.
 
 ## Distribute
 - To build distribution, use:
-    `cargo flutter --format appimage build --release`# Install
+    `cargo flutter --format appimage build --release`
 
 # Contribution
 To contribute to flutter-rs, please see [CONTRIBUTING](CONTRIBUTING.md).
@@ -45,5 +45,6 @@ To contribute to flutter-rs, please see [CONTRIBUTING](CONTRIBUTING.md).
 [crates-url]: https://crates.io/crates/flutter-engine
 [mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
 [mit-url]: LICENSE-MIT
+[flutter-app-template]: https://user-images.githubusercontent.com/741807/72476798-5a99e280-37ee-11ea-9e08-b0175ae21ad6.png
 [demo-ui]: https://raw.githubusercontent.com/flutter-rs/flutter-rs/master/www/images/demo_ui.png