I am trying to use the command line to open the the jquery-rails gem. I am using the command: `bundle open jquery-rails` and I am getting the message returned: `To open a bundled gem, set $EDITOR or $BUNDLE_EDITOR`

Forgive me if this is totally newb, but how do I set my text editor Notepad++ like the message is telling me to? I am using windows vista/Rails 3.1

Thanks for any advice.