Update requirements section.

README.md

@@ -45,19 +45,20 @@
 * [jQuery](http://jquery.com/) v. 1.6+
 * [jQuery UI widget factory](http://wiki.jqueryui.com/w/page/12138135/Widget%20factory) v. 1.8.16+
 * [jQuery Iframe Transport plugin](https://github.com/blueimp/jQuery-File-Upload/blob/master/jquery.iframe-transport.js) (included)
+* [JavaScript Templates engine](https://github.com/blueimp/JavaScript-Templates) v. 1.0.2+ (optional)
 * [JavaScript Load Image function](https://github.com/blueimp/JavaScript-Load-Image) v. 1.1.4+ (optional)
 * [JavaScript Canvas to Blob function](https://github.com/blueimp/JavaScript-Canvas-to-Blob) v. 1.0.1+ (optional)
-* [JavaScript Templates engine](https://github.com/blueimp/JavaScript-Templates) v. 1.0.2+ (optional)
 * [Bootstrap CSS Toolkit](https://github.com/twitter/bootstrap/) v. 2.0+ (optional)
 
-The jQuery UI widget factory is a requirement for the basic File Upload plugin, but very lightweight without any other dependencies. 
-The UI version of the File Upload plugin also requires the JavaScript Templates engine and the JavaScript Load Image function (for the upload image previews). These dependencies are marked as optional, as the basic File Upload plugin can be used without them and the UI version of the plugin can be extended to override these dependencies with alternative solutions.
+The jQuery UI widget factory is a requirement for the basic File Upload plugin, but very lightweight without any other dependencies.  
+The jQuery Iframe Transport is required for [browsers without XHR file upload support](https://github.com/blueimp/jQuery-File-Upload/wiki/Browser-support).  
+The UI version of the File Upload plugin also requires the JavaScript Templates engine as well as the JavaScript Load Image and JavaScript Canvas to Blob functions (for the image previews and resizing functionality). These dependencies are marked as optional, as the basic File Upload plugin can be used without them and the UI version of the plugin can be extended to override these dependencies with alternative solutions.
 
 The User Interface is built with Twitter's [Bootstrap](https://github.com/twitter/bootstrap/) Toolkit. This enables a CSS based, responsive layout and fancy transition effects on modern browsers. The demo also includes the [Bootstrap Image Gallery Plugin](https://github.com/blueimp/Bootstrap-Image-Gallery). Both of these components are optional and not required.
 
-The repository also includes the [jQuery XDomainRequest Transport Plugin](https://github.com/blueimp/jQuery-File-Upload/blob/master/cors/jquery.xdr-transport.js), which is required for Cross-domain AJAX requests in Microsoft Internet Explorer >= 8. It is only included for the [Demo](http://blueimp.github.com/jQuery-File-Upload/), which makes use of Cross-domain DELETE requests (GET requests for IE) to delete uploaded files from the Demo File Upload service.
+The repository also includes the [jQuery XDomainRequest Transport plugin](https://github.com/blueimp/jQuery-File-Upload/blob/master/js/cors/jquery.xdr-transport.js), which enables Cross-domain AJAX requests (GET and POST only) in Microsoft Internet Explorer >= 8. However, the XDomainRequest object doesn't support file uploads and the plugin is only used by the [Demo](http://blueimp.github.com/jQuery-File-Upload/) for Cross-domain requests to delete uploaded files from the demo file upload service.
 
-[Cross-domain File Uploads](https://github.com/blueimp/jQuery-File-Upload/wiki/Cross-domain-uploads) using the [Iframe Transport plugin](https://github.com/blueimp/jQuery-File-Upload/blob/master/jquery.iframe-transport.js) require a redirect back to the origin server to retrieve the upload results. The example implementation makes use of [result.html](https://github.com/blueimp/jQuery-File-Upload/blob/master/cors/result.html) as redirect page. See also the example code in [application.js](https://github.com/blueimp/jQuery-File-Upload/blob/master/application.js) as well as the explanation of all [files in the repository](https://github.com/blueimp/jQuery-File-Upload/wiki/Plugin-files).
+[Cross-domain File Uploads](https://github.com/blueimp/jQuery-File-Upload/wiki/Cross-domain-uploads) using the [Iframe Transport plugin](https://github.com/blueimp/jQuery-File-Upload/blob/master/js/jquery.iframe-transport.js) require a redirect back to the origin server to retrieve the upload results. The [example implementation](https://github.com/blueimp/jQuery-File-Upload/blob/master/js/main.js) makes use of [result.html](https://github.com/blueimp/jQuery-File-Upload/blob/master/cors/result.html) as a static redirect page for the origin server.
 
 ## Browser Support (tested versions)
 * Google Chrome - 7.0+