diff --git a/.emacs.d/.gitignore b/.emacs.d/.gitignore
index 93889d4..6e4464f 100644
--- a/.emacs.d/.gitignore
+++ b/.emacs.d/.gitignore
@@ -41,5 +41,6 @@ server
 /forge-database.sqlite
 /history
 /tree-sitter
+!/tree-sitter/README.md
 /lib
 /lib64
\ No newline at end of file
diff --git a/.emacs.d/tree-sitter/README.md b/.emacs.d/tree-sitter/README.md
new file mode 100644
index 0000000..dc12fbd
--- /dev/null
+++ b/.emacs.d/tree-sitter/README.md
@@ -0,0 +1,9 @@
+# tree-sitter
+
+```
+git clone git@github.com:emacs-mirror/emacs.git --depth 1
+cd emacs/admin/notes/tree-sitter/build-module
+./batch.sh
+mv dist/*.so ~/.emacs.d/tree-sitter
+```
+see also https://zenn.dev/nyoho/articles/df0aced5f5dd8b