diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..b997271
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "src/lisp/vendor/luajit"]
+	path = src/lisp/vendor/luajit
+	url = https://luajit.org/git/luajit.git