diff --git a/.asdf b/.asdf
new file mode 160000
index 0000000..d1a563d
--- /dev/null
+++ b/.asdf
@@ -0,0 +1 @@
+Subproject commit d1a563dcc0107d5c631f73b114044898b5cadcf9
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..dfcb371
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "asdf-vm"]
+	path = .asdf
+	url = https://github.com/asdf-vm/asdf.git
+	branch = master