diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..c4f4295
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "external"]
+	path = external
+	url = https://github.com/Wiimm/wiimms-iso-tools
diff --git a/external b/external
new file mode 160000
index 0000000..fc1c0b8
--- /dev/null
+++ b/external
@@ -0,0 +1 @@
+Subproject commit fc1c0b840cb3ac41ca6e4f1d5e16da12b47eab58