diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6a442f5
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "ext/rusefi"]
+	path = ext/rusefi
+	url = https://github.com/rusefi/rusefi
diff --git a/ext/rusefi b/ext/rusefi
new file mode 160000
index 0000000..70ce51b
--- /dev/null
+++ b/ext/rusefi
@@ -0,0 +1 @@
+Subproject commit 70ce51b3f203adce61fea2e7d6ccb0e1fd06f63a