diff --git a/README.md b/README.md
index 3c85697..7178083 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,8 @@ Doodle3D client app
 # How to build
 
 ## Prerequisites
-- get `npm`, the Node.js package manager, for instance using macports on OSX.
-- (prerequisite) install Grunt: `sudo pm install -g grunt-cli`.
+- install npm, the Node.js package manager: `sudo port install npm`
+- install Grunt: `sudo npm install -g grunt-cli`
 - run `npm install` in the project root to install project dependencies
 
 Finally run grunt to build minified css and js files. By default, it will keep