Adding Last Updated Shortcode to Footer

Thanks for the plugin – just what I needed!

I was trying to get this to work in the footer and I thought I’d share the code here in case others need it too:

<?php echo do_shortcode('[lastupdated]'); ?>

The one given (below) did not work:
<?php do_shortcode( [lastupdated] ); ?>

https://www.ads-software.com/extend/plugins/last-updated-shortcode/