Update README.md

README.md

@@ -2,9 +2,9 @@ Polymer docs are mostly in Markdown with some HTML. [Jekyll][jekyll] is used to
 
 ## Prereqs and installation requirements
 
-We use Jekyll 1.4.2+ and [Grunt][grunt] to generate the documentation, and compass to compile SASS to CSS. You'll need to install the requirements before working on the docs (these instructions assume [NPM is already installed](http://nodejs.org/download/)):
+We use Jekyll 2.0+ and [Grunt][grunt] to generate the documentation, and compass to compile SASS to CSS. You'll need to install the requirements before working on the docs (these instructions assume [NPM is already installed](http://nodejs.org/download/)):
 
-    gem install jekyll kramdown jekyll-page-hooks compass
+    gem install jekyll kramdown jekyll-page-hooks compass rouge
     npm install -g grunt-cli
 
 **Note:** If you receive permission warnings, you may need to run the above tasks with `sudo`.