Specifying need for imagemagick and giving directions in resizing section

Hi there - Love Carrierwave and thank you! I just wanted to save someone else an hour of googling by mentioning that they need imagemagick installed and RMagick installed to use the handy thumbnail resizing. Luckily I'm in code school so I had someone to ask but to a less-seasoned programmer (like me), this information would be very helpful. Thanks!