Make thumbnail image link to post

I’d like to make the thumbnail images link to the post pages. I removed the ‘Read More’ that comes up on hover.

Where do I find this in the PHP? Is it this section of content.php?

<div class="featured-thumb col-md-4">
	<a href="<?php the_permalink(); ?>">
	<?php if (has_post_thumbnail()) :
		the_post_thumbnail('homepage-banner');
	endif;
	?>
	</a>
	</div>

Thanks for any hints.