Joomla plugin install XML files <folder> tag

While developing a joomla plugin, if my plugin folder looks like so:

/install.xml
/mainPg.php
/subfolder/lib.php
/subfolder/config.php

Would the tag look like this?

<files>
    <filename plugin="mainPg">mainPg.php</filename>
    <folder>subfolder</folder>
</files>

From stackoverflow

• Looks ok. Did you test it?

  For docs see: http://docs.joomla.org/Components:xml_installfile