diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000..03d9b528f9
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "modules/PX4Firmware"]
+	path = modules/PX4Firmware
+	url = git://github.com/diydrones/PX4Firmware.git
+[submodule "modules/PX4NuttX"]
+	path = modules/PX4NuttX
+	url = git://github.com/diydrones/PX4NuttX.git
+[submodule "modules/uavcan"]
+	path = modules/uavcan
+	url = git://github.com/diydrones/uavcan.git