When specifying dependencies in your module's .info file, you now can (and are encouraged to) specify the project that your module depends on also (since Drupal 7.40) - for example, dependencies[] = views:views_ui to declare a dependency on the Views UI module within the Views project, rather than just dependencies[] = views_ui. This extra information will help resolve ambiguities and can potentially be used by other tools in the future, for example by the drupal.org testbot or Drush to be able to automatically download dependencies that currently can't be downloaded automatically.