Anchor inside select list label

Around line 44

'int_phone'=> array('label' => t('International Phone Numbers, as per E.123'))

I don't think you can have an anchor tag at here. I changed it to this for my site:

'int_phone'=> array('label' => t('International Phone Numbers, as per E.123')) //http://www.itu.int/rec/T-REC-E.123/en

Anyone else have a better way to still reference the E.123?