readme tweak for #1535

README.md

@@ -875,7 +875,7 @@ Reveal.initialize({
 
 Then:
 
-1. Install [Node.js](http://nodejs.org/)
+1. Install [Node.js](http://nodejs.org/) (1.0.0 or later)
 2. Run ```npm install```
 3. Run ```node plugin/notes-server```
 
@@ -1061,7 +1061,7 @@ The core of reveal.js is very easy to install. You'll simply need to download a
 
 Some reveal.js features, like external Markdown and speaker notes, require that presentations run from a local web server. The following instructions will set up such a server as well as all of the development tasks needed to make edits to the reveal.js source code.
 
-1. Install [Node.js](http://nodejs.org/)
+1. Install [Node.js](http://nodejs.org/) (1.0.0 or later)
 
 2. Install [Grunt](http://gruntjs.com/getting-started#installing-the-cli)