diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index 08958b1..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2020 Yusuke Hosonuma
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
diff --git a/README.md b/README.md
index 20f5d92..be5d377 100644
--- a/README.md
+++ b/README.md
@@ -6,11 +6,16 @@ The Conway's Game of Life that build with SwiftUI.
 |--|--|--|
 |<img src="./Image/screenshot-ios.png" width="160px">|<img src="./Image/screenshot-ipad.png" width="200px">|<img src="./Image/screenshot-mac.png" width="400px">|
 
-## Architecture
+## Requirements
 
-Like MVVM. (below diagram is old...)
+- Xcode 12 (beta 4)
+- macOS Catalina
+  - **macOS Big Sur is required when build macOS app**
 
-![Architecture](./Image/architecture.png)
+**Important:**
+
+Not included `GoogleService-Info.plist` that is needed to access to Firebase currently.
+This will be added in the near future.
 
 ## Dependency
 
@@ -19,7 +24,3 @@ Like MVVM. (below diagram is old...)
 ## Author
 
 Yusuke Hosonuma / [@tobi462](https://twitter.com/tobi462)
-
-## License
-
-MIT license.