README.md in requirejs-rails-0.5.3 vs README.md in requirejs-rails-0.5.4

@@ -109,14 +109,18 @@
     $(id).append('<div>hello!</div>')
 ```
 
 ### Backbone.js
 
-Backbone AMD support is underway.  See pull request documentcloud/backbone#710 for details.  In the meantime, you can download [Backbone 0.5.3 with AMD support](https://github.com/jrburke/backbone/raw/optamd3/backbone.js) from [jrburke's optamd3 branch](https://github.com/jrburke/backbone/tree/optamd3).  Backbone's module name is `backbone`.
+**DO NOT USE vanilla Backbone 0.5.3 with require.js!**
 
+Backbone with AMD support hasn't been released yet.  In the meantime, you can download [Backbone 0.5.3 with AMD support](https://github.com/jrburke/backbone/raw/optamd3/backbone.js) from [jrburke's optamd3 branch](https://github.com/jrburke/backbone/tree/optamd3).  See pull request [documentcloud/backbone#710](https://github.com/documentcloud/backbone/pull/710) for details.  Backbone's module name is `backbone`.
+
 ### Underscore.js
 
-Underscore version 1.2.2 or later has integrated AMD support.  Get it from [Underscore.js' homepage](http://documentcloud.github.com/underscore/). Underscore's module name is `underscore`.
+Underscore version 1.2.x, 1.2.2 or later has integrated AMD support.  Get it from [Underscore.js' homepage](http://documentcloud.github.com/underscore/). Underscore's module name is `underscore`.
+
+**IMPORTANT:** Underscore has **removed** AMD support again in the 1.3.x series.  Please consult the [requirejs mailing list](http://groups.google.com/group/requirejs/) for the current recommended solution.
 
 ## Changes
 
 Usage changes that impact folks upgrading along the 0.x series are documented here.