Source Reference:

• Component: bbPress:: bbp-core

  File: /bbp-includes/bbp-core-caps.php :: Trac Source Line: 45

  	if ( empty( $default->capabilities ) )
  		$default->capabilities = array( 'read' );
  
  	// Moderators are default role + forum moderating caps in bbp_add_caps()
  	add_role( $moderator_role,   'Forum Moderator',   $default->capabilities );
  
  	// Forum Subscribers are auto added to sites with global forums
  	add_role( $participant_role, 'Forum Participant', $default->capabilities );
  
  	do_action( 'bbp_add_roles' );
  }
  
  /**
   * Adds capabilities to WordPress user roles.
   *
   * This is called on plugin activation.
   *
   * @since bbPress (r2608)
   *
   * @uses get_role() To get the administrator, default and moderator roles