Trying to add a google font

Hi,

I am trying to add a Google font (Caveat Brush), using the following code from the FAQ:

add_filter( 'avf_google_heading_font', 'avia_add_heading_font');
function avia_add_heading_font($fonts)
{
$fonts['Caveat Brush'] = 'Caveat+Brush';
return $fonts;
}

add_filter( 'avf_google_content_font', 'avia_add_content_font');
function avia_add_content_font($fonts)
{

$fonts['Caveat Brush'] = 'Caveat+Brush';
return $fonts;
}

I also tried it without the + but it does not show up in my fonts list.

Any ideas what I am doing wrong?

Thanks in advance