diff --git a/LICENSE b/LICENSE
index 1ad3638..00addbe 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021-2022 Koji Yokokawa
+Copyright (c) 2021-2024 Koji Yokokawa
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 4367699..ea9426d 100644
--- a/README.md
+++ b/README.md
@@ -8,17 +8,11 @@ Open https://xcratch.github.io/ then press _'Open Editor'_ button.
 
 ## Development
 
-There are some npm scripts for development.
-
-- setup
-  It replaces the logo and the default project.
-
-- start
-  It starts GUI dev-server with https.
+This site is developed with [xcratch/scratch-vm](https://github.com/xcratch/scratch-vm) and [xcratch/scratch-gui](https://github.com/xcratch/scratch-gui).
 
 ## Sponsors
 
-2022-
+2022-2024:
 
 ### TFabWorks
 [![TFabWorks](https://tfabworks.com/wp-content/themes/tfabworks/img/logo/logo-png.png)](https://tfabworks.com/)