diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..bd6ba15
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "Carthage/Checkouts/DifferenceKit"]
+	path = Carthage/Checkouts/DifferenceKit
+	url = https://github.com/ra1028/DifferenceKit.git
diff --git a/Carthage/Checkouts/DifferenceKit b/Carthage/Checkouts/DifferenceKit
new file mode 160000
index 0000000..fcb2953
--- /dev/null
+++ b/Carthage/Checkouts/DifferenceKit
@@ -0,0 +1 @@
+Subproject commit fcb295369cb217a70b62610f3c46fbecca86f4ad