Update README.md

Note that you'll need grunt in the notes at the top.
PencilCode · Feb 14, 2014 · d0fc6f3 · d0fc6f3
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Showing 1 changed file with 3 additions and 2 deletions.
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@@ -11,8 +11,9 @@ grunt
 </pre>
 
 Development can be done on Linux, Mac, or Windows.
-The prerequisites are a standard node.js development environment,
-which is very widely used.
+The prerequisites are a standard node.js development environment
+which is very widely used, plus grunt (you'll need to
+`npm install -g grunt-cli`).
 
 Prerequisites
 -------------