diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..ccc0adf
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "protobuf"]
+	path = protobuf
+	url = https://github.com/google/protobuf.git
diff --git a/protobuf b/protobuf
new file mode 160000
index 0000000..b262575
--- /dev/null
+++ b/protobuf
@@ -0,0 +1 @@
+Subproject commit b262575bf2d80fe13b06ac2b53a06e3e11c9e34c