<configure
    xmlns="http://namespaces.zope.org/zope"
    i18n_domain="plone.app.discussion">

    <!-- custom permissions are defined here -->

    <permission
        id="plone.app.discussion.ReviewComments"
        title="Review comments"
        />

    <permission
        id="plone.app.discussion.EditComments"
        title="Edit comments"
        />


</configure>
