diff --git a/.gitmodules b/.gitmodules
index 05d91d3..2f15d51 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "src/main/proto"]
 	path = src/main/proto
 	url = ssh://vcs@phabricator.internetapi.cn:2222/source/bdchain-grpc-api.git
+	branch = master
diff --git a/src/main/proto b/src/main/proto
new file mode 160000
index 0000000..3c7efb0
--- /dev/null
+++ b/src/main/proto
@@ -0,0 +1 @@
+Subproject commit 3c7efb095d6392eec9d30b2c706af52541384095