diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..a21b219
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tools/dmg2img-src"]
+	path = tools/dmg2img-src
+	url = https://github.com/foxlet/dmg2img.git
diff --git a/tools/dmg2img-src b/tools/dmg2img-src
new file mode 160000
index 0000000..86380fd
--- /dev/null
+++ b/tools/dmg2img-src
@@ -0,0 +1 @@
+Subproject commit 86380fd67d5e3ef2896384513a7df1c75fe7ef38