diff --git a/README.md b/README.md
index 16f8f989e5c61..d121acdc50edc 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,7 @@ it'll be converted to `/docs/index.html`.
 * [Codefellows.org](https://www.codefellows.org)
 * [ollieglass.com](http://ollieglass.com/)
 * [waigojs.com](https://waigojs.com/) ([source](https://github.com/waigo/waigo.github.io))
+* [The State Of JavaScript](http://stateofjs.com/)
 * [Edit this file to add yours!](https://github.com/gatsbyjs/gatsby/blob/master/README.md)
 
 *Note, for the sites that have made their source available, you can
@@ -383,6 +384,11 @@ export.postBuild = function(pages, callback) {
 
 [Webpack doesn't currently support hot-reloading new files added to a context](https://github.com/webpack/webpack/issues/1162). When you add a new file, restart the `gatsby develop` process and your new page will show up.
 
+Make sure you also including the **trailing slash** in your URLs:
+
+- Bad: `http://localhost:8000/foo`
+- Good: `http://localhost:8000/foo/`
+
 ### Inline CSS
 
 A neat performance feature supported by Gatsby is inlining your CSS in