diff --git a/README.md b/README.md
index 80f4922..f818727 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,6 @@ const datahubConfig = {
       hub: 'project_name',
       port: 8080,
       hostname: 'localhost',
-      // see more details: https://github.com/pillarjs/path-to-regexp
       pathOptions: {
         start: true
       }
@@ -58,6 +57,8 @@ const datahubConfig = {
 datahubMiddleware(app)(datahubConfig);
 ```
 
+*notice* version 6 has a break change that needs special attention, see [more details](https://github.com/pillarjs/path-to-regexp).
+
 ## Use with webpack-dev-server
 
 [live demo](//github.com/macaca-sample/webpack-datahub-sample)