change proto README cpp node ruby
diff --git a/cpp/helloworld/greeter_client.cc b/cpp/helloworld/greeter_client.cc
index 4a51f5e..3c2bbc2 100644
--- a/cpp/helloworld/greeter_client.cc
+++ b/cpp/helloworld/greeter_client.cc
@@ -62,7 +62,7 @@
     HelloReply reply;
     ClientContext context;
 
-    Status status = stub_->sayHello(&context, request, &reply);
+    Status status = stub_->SayHello(&context, request, &reply);
     if (status.IsOk()) {
       return reply.message();
     } else {