diff --git a/proto/internal.proto b/proto/internal.proto
new file mode 100644
index 0000000..8f1ecd4
--- /dev/null
+++ b/proto/internal.proto
@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package proto;
+
+message HelloRequest {
+  string name = 1;
+}
+
+message HelloResponse {
+  string message = 1;
+}
+
+service HelloService {
+  rpc Hello(HelloRequest) returns (HelloResponse);
+}