Not clear enough that sub-module print_ui should be installed

OK, so this node https://www.drupal.org/node/306882 does tell you that you need to install print_ui. However the project main page makes no mention of it.

I just spent 20 minutes looking at the source code before I worked out what I did wrong, and I'm not the only one, because there is a comment here https://www.drupal.org/node/306886#comment-10556560.

Please can you make it more obvious that sub-module print_ui should be installed? Thanks.