Index: src/wp-content/themes/twentyfifteen/inc/template-tags.php
===================================================================
--- src/wp-content/themes/twentyfifteen/inc/template-tags.php	(revision 33001)
+++ src/wp-content/themes/twentyfifteen/inc/template-tags.php	(working copy)
@@ -119,7 +119,7 @@
 
 	if ( ! is_single() && ! post_password_required() && ( comments_open() || get_comments_number() ) ) {
 		echo '<span class="comments-link">';
-		comments_popup_link( __( 'Leave a comment', 'twentyfifteen' ), __( '1 Comment', 'twentyfifteen' ), __( '% Comments', 'twentyfifteen' ) );
+		comments_popup_link( sprintf( __( 'Leave a comment<span class="screen-reader-text"> on %s</span>' ), get_the_title() ) );
 		echo '</span>';
 	}
 }