diff --git a/doc/sources/libnghttp2_asio.rst b/doc/sources/libnghttp2_asio.rst
index e358399a..a63f1a60 100644
--- a/doc/sources/libnghttp2_asio.rst
+++ b/doc/sources/libnghttp2_asio.rst
@@ -145,6 +145,8 @@ Server push is also supported.
            if(req->path() == "/my.css") {
              res->write_head(200);
              res->end(file_reader("my.css"));
+
+             return;
            }
 
            res->write_head(404);