diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..d4941ff7
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "grpc/grpc-idl"]
+	path = grpc/grpc-idl
+	url = https://github.com/pinpoint-apm/pinpoint-grpc-idl.git
\ No newline at end of file