Register a new widget area in a Genesis Framework site.

registerwidget.php

/** Register widget area */
genesis_register_sidebar( array(
    'id'    => 'my-widget', // Feel free to use a more meaningful name here
    'name'  => __( 'My Widget', 'theme-slug' ),
    'description'   => __( 'This is a description of my new widget area', 'theme-slug' ),
) );