Display category descriptions on archive pages

Hello!

I’m trying to display the category description on the category archive pages, but the tag that I found isn’t working.

I’m using <?php echo category_description(...); ?> in category.php, but the description does not appear. Am I doing something wrong?

Here’s my category.php:

<?php
	if ( isset( $_GET['blog_type'] ) )
	{
		if ( $_GET['blog_type'] == 'simple' )
		{
			get_template_part( 'blog', 'simple' );
		}
		elseif ( $_GET['blog_type'] == 'masonry' )
		{
			get_template_part( 'blog', 'masonry' );
		}
		else
		{
			get_template_part( 'blog', 'regular' );
		}
	}
	else
	{
		$blog_type = get_option( 'category_archive_type', 'Regular' );

		if ( $blog_type == 'Simple' )
		{
			get_template_part( 'blog', 'simple' );
		}
		elseif ( $blog_type == 'Masonry' )
		{
			get_template_part( 'blog', 'masonry' );
		}
		else
		{
			get_template_part( 'blog', 'regular' );
		}
	}
?>

Can you help me? Thanks! ??