Confusion on Scaffolding page

Created by: ifpingram

http://twitter.github.io/bootstrap/scaffolding.html

When following the tutorial and playing around with the grids and trying to make two rows, the rows just stack up because there is no mention that the div.container is required to wrap around them in order for rows to be made. This caused some consternation and it was only when I looked on an external tutorial that I realised it required the container. The div.container is mentioned next, whereas for complete newbies like myself, it may have been better to make note of this before.