diff --git a/lib/rb/ext/protocol.h b/lib/rb/ext/protocol.h
index 09eca76..5369530 100644
--- a/lib/rb/ext/protocol.h
+++ b/lib/rb/ext/protocol.h
@@ -1,4 +1,4 @@
-/**
+/*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements. See the NOTICE file
  * distributed with this work for additional information