diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..25ba15e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "eagle-diff"]
+	path = eagle-diff
+	url = https://github.com/fxkr/eagle-diff.git
diff --git a/eagle-diff b/eagle-diff
new file mode 160000
index 0000000..23fc665
--- /dev/null
+++ b/eagle-diff
@@ -0,0 +1 @@
+Subproject commit 23fc6656bac2e305bede7d81b0256bddb0a14b7b