Doesn't appear to search product tags

Hi,
It appears this add-in doesn’t search product tags, only title and description.
is it possible to add this?

On the bright side, this add-in at least respects the “catalogue only” (hide from search results) option for products. lots of other search add-ins ignore that which is a pain.

http://wordpress.org/plugins/yith-woocommerce-ajax-search/