README.md in lookbook-0.2.3 vs README.md in lookbook-0.2.4

@@ -191,9 +191,21 @@
 
 ```ruby
 config.lookbook.listen_paths << Rails.root.join('app/other/directory')
 ```
 
+## Troubleshooting
+
+#### Blank preview window
+
+Certain setups (for example when using `Rack::LiveReload`) can cause an issue with the way that the preview iframe displays the rendered component preview (i.e. using the `srcdoc` attribute to avoid extra requests).
+
+If you are seeing a blank preview window, but the source and output tabs are both displaying code as expected, you can disable the use of the `srcdoc` attribute using the following configuration option:
+
+```ruby
+config.lookbook.preview_srcdoc = false
+```
+
 ## Contributing
 
 Lookbook is very much a small hobby/side project at the moment. I'd love to hear from anyone who is interested in contributing but I'm terrible at replying to emails or messages, so don't be surprised if I take forever to get back to you. It's not personal 😜
 
 ### Developing on a local version of Lookbook