diff --git a/lib/app/server.js b/lib/app/server.js
index 9c04c56fdb..461991b2e6 100644
--- a/lib/app/server.js
+++ b/lib/app/server.js
@@ -25,6 +25,7 @@ export default context => {
   // create context.next for simulate next() of beforeEach() when wanted to redirect
   context.redirected = false
   context.next = function (opts) {
+    // if nuxt generate
     if (!context.res) {
       context.redirected = opts
       context.nuxt.serverRendered = false