Custom Social Icons

Hi,

I’m trying to add a custom social icon to my header, I’ve tried adding

// We'll use the Kriesi.at glyph for this example
function avia_add_custom_social_icon($icons) {
	$icons['Kriesi'] = 'kriesi';
	return $icons;
}
add_filter('avf_social_icons_options','avia_add_custom_social_icon', 10, 1);

to functions.php but it doesn’t appear in the dropdown box in Social Profiles. I must be doing something wrong?