Show only post with a specific category

I have the following code on one of my pages. What do I need to do to it to make it only show a certain category?

<?php get_header(); ?>
	<div id="content-full2">
	<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
        <div class="post" id="post-<?php the_ID(); ?>">
           	<h2><?php the_title(); ?></h2>
            <div class="entry">
				<?php the_content(); ?>
            </div>
        </div>
	<?php endwhile; endif; ?>
<?php get_footer(); ?>