diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..75f3905
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,27 @@
+# Copyright 2025 Shota FUJI <pockawoooh@gmail.com>
+# SPDX-License-Identifier: MIT
+
+# Do not use `.editorconfig` file outside this project.
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+
+[{*.html,*.css,readme}]
+indent_style = space
+indent_size = 2
+
+# YAML does not support tab indentation
+[*.{yaml,yml}]
+indent_style = space
+indent_size = 2
+
+# Nix does not like tab indentation
+# https://github.com/NixOS/nix/issues/3759
+[*.nix]
+indent_style = space
+indent_size = 2
diff --git a/license b/license
index fc9152a..8c4e870 100644
--- a/license
+++ b/license
@@ -1,6 +1,7 @@
 The MIT License (MIT)
 
 Copyright (c) Anirudh Oppiliappan <x@icyphox.sh>
+Copyright 2025 Shota FUJI <pockawoooh@gmail.com>
 
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the