diff --git a/README.md b/README.md
index d86cc3a..3c85697 100644
--- a/README.md
+++ b/README.md
@@ -6,8 +6,8 @@ Doodle3D client app
 
 ## Prerequisites
 - get `npm`, the Node.js package manager, for instance using macports on OSX.
-- (prerequisite) install Grunt: `npm install -g grunt-cli`.
-- run npm install in the project root to install project dependencies
+- (prerequisite) install Grunt: `sudo pm 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
 running to automatically rebuild when source files are changed.