WordPress adjust loop query - used on FHC search.php

WordPress adjust loop query

<?php
	global $query_string;
	query_posts($query_string . "&post_type=document");
?>


<?php if (have_posts()): while (have_posts()) : the_post(); ?>

	<!-- article -->
	<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>

		<!-- post title -->
		<h3>
			<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a>
		</h3>
		<!-- /post title -->

			<!-- post details -->
			<div class="meta-data">
				<div class="date">
					<?php
						echo get_the_time('F jS')." ";
						echo "<span class='year'>".get_the_time('Y')."</span>";
					?>
				</div>
				<div class="author">
					<?php _e( 'Writer: ', 'html5blank' ); ?> <?php echo get_the_author(); ?>
				</div>
				<?php the_image_credits(); ?>
			</div>
			<!-- /post details -->

		<?php
			// $examplePost = get_post();
			// echo $examplePost->ID; // Display the post's ID
			// echo "<pre>";
			// 	print_r($examplePost);
			// echo "</pre>";
		?>

		<?php html5wp_excerpt('html5wp_index'); // Build your custom callback length in functions.php ?>

		<?php edit_post_link(); ?>

	</article>
	<!-- /article -->

<?php endwhile; ?>

<?php else: ?>

	<!-- article -->
	<article>
		<h2><?php _e( 'Sorry, nothing to display.', 'html5blank' ); ?></h2>
	</article>
	<!-- /article -->

<?php endif; ?>

<?php wp_reset_query(); ?>