Update README.md

examples/with-static-export/README.md

@@ -9,6 +9,9 @@ curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz --strip=2
 cd with-static-export
 ```
 
+> This example requires [Node.js 8](https://nodejs.org/en/download/current/) or a later version.
+> (That's for the use of "async await" in the `next.config.js`.)
+
 Install it and run:
 
 ```bash