README.md in onebox-1.5.10 vs README.md in onebox-1.5.11

@@ -70,11 +70,21 @@
 url = "http://www.amazon.com/gp/product/B005T3GRNW/ref=s9_simh_gw_p147_d0_i2"
 preview = Onebox.preview(url)
 "#{preview}" == preview.to_s #=> true
 ```
 
+Development Preview Interface
+=============================
 
+The onebox gem comes with a development server for previewing the results
+of your changes. You can run it by running `rake server` after checking
+out the project. You can then try out URLs.
+
+The server doesn't reload code changes automatically (PRs accepted!) so
+make sure to hit CTRL-C and restart the server to try a code change out.
+
+
 Adding Support for a new URL
 ============================
 
   1. Check if the site supports [oEmbed](http://oembed.com/) or [Open Graph](https://developers.facebook.com/docs/opengraph/).
      If it does, you can probably get away with just whitelisting the URL in `Onebox::Engine::WhitelistedGenericOnebox`.
@@ -170,10 +180,10 @@
 ==========
 
 Add this line to your application's Gemfile:
 
     gem "onebox", "~> 1.2"
-    
+
 And then execute:
 
     $ bundle
 
 Or install it yourself as: