Exclude a single module from a Drush update? Is there a way to exclude a module from a Drush update so it can be ignored when running eg 'drush up' ?

I ask because Rules 2.8 is causing problems with Drupal Commerce but it would be great if everything else could still be updated with Drush.
You can use the following command: 

drush pm-update --lock=modulename


There is a post here about it: http://blog.wassill.eu/en/blog/short-excludes-modules-drush-update-09-04-2013