diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6165bce
--- /dev/null
+++ b/README.md
@@ -0,0 +1,12 @@
+# Lua lib in C
+
+## referenced
+I referenced these
+- https://gitlab.com/qwjyh/sample_lua_lib_with_c
+- https://densan-labs.net/tech/lua/chapter6.html
+- https://ichigopack.net/lua/c_api.html
+- https://luals.github.io/wiki/export-docs/
+- https://luals.github.io/wiki/usage/
+- https://lua.org/manual/5.4/manual.html#luaL_error
+- https://luals.github.io/wiki/annotations/#meta
+- https://github.com/LuaLS/lua-language-server/blob/master/meta/template/io.lua