diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..085c1c42
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "urtypes"]
+	path = src/vendor/urtypes
+	url = git@github.com:jreesun/urtypes.git
diff --git a/src/vendor/urtypes b/src/vendor/urtypes
new file mode 160000
index 00000000..8d643aa7
--- /dev/null
+++ b/src/vendor/urtypes
@@ -0,0 +1 @@
+Subproject commit 8d643aa7f5bf1e3295a5e176afcfb5b6240d66e6