Como colocar link no thumbnail???

Oi pessoal, como que eu faço para colocar o link do post direto no tumbnail??

Segue o código q eu estou usando na index, alguém pode me ajudar?

<?php
/**
* @package Magnus
*/

?>

<article id="post-<?php the_ID(); ?>" <?php post_class('section'); ?>>
	<a href="%s" rel="bookmark">'
	<?php if ( has_post_thumbnail() ) :
 $image_id = get_post_thumbnail_id();
 $url = wp_get_attachment_image_src( $image_id, 'magnus-large' );
	?></a>

	<div class="section-image" style="background-image: url(<?php echo esc_attr( $url[0] ); ?>);">

	<?php else: ?>

	<div class="section-image">

	<?php endif; ?>

	</div><!-- .section-image -->

	<div class="section-inner">
 <header class="entry-header">
 <?php the_title( sprintf( '<h1 class="entry-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h1>' ); ?>
 <?php if ( 'post' == get_post_type() ) : ?>
 <?php /*
 <div class="entry-meta">
 <?php magnus_posted_on(); ?>
 </div><!-- .entry-meta -->
 */ ?>
 <?php endif; ?>
 </header><!-- .entry-header -->
	</div><!-- .section-inner -->

</article><!-- #post-## -->