diff --git a/helloworld/proto/helloworld.proto b/helloworld/proto/helloworld.proto
index 4a6ce3c..57ab33c 100644
--- a/helloworld/proto/helloworld.proto
+++ b/helloworld/proto/helloworld.proto
@@ -7,6 +7,7 @@ service Helloworld {
 	rpc Call(Request) returns (Response) {}
 }
 
+// Call returns a personalised "Hello $name" response
 message Request {
 	string name = 1;
 }