diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..5e9754e
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017-2024 Yusuke Hirao
+
+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/cspell.json b/cspell.json
index b14f715..5767ead 100644
--- a/cspell.json
+++ b/cspell.json
@@ -10,6 +10,7 @@
 		"typescript"
 	],
 	"words": [
+		"Hirao",
 		"kagan",
 		"kagankan",
 		"markuplint",
@@ -17,6 +18,7 @@
 		"MindBEMding",
 		"rdfa",
 		"shiki",
-		"shikijs"
+		"shikijs",
+		"Yusuke"
 	]
 }