diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..3540cd8
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "submodules/nanopb"]
+	path = submodules/nanopb
+	url = https://github.com/nanopb/nanopb
+	branch = master