twitter/bootstrap — pull request #1417 by scott-stewart (2012-01-30 01:58:52+00:00)
Title: 2.0 wip typo in docs/base-css.html 

Under the "Form validation" section in docs/base-css.html, the doc says:

To use, add the a class to the surrounding .control-group.

...
class="control-group error"
…

Changed it to:
To use, add the error class to the surrounding .control-group.