<?xml version="1.0" encoding="utf-8"?>
<form>
    <config>
        <fields name="params">
            <fieldset name="splitmenu" label="Splitmenu Menu Options" addfieldpath="/modules/mod_roknavmenu/fields">
                <field name="splitmenu_item_subtext" type="text" default="" label="Subtext Line" description="You can put a second line here" />
            </fieldset>
        </fields>
    </config>
</form>