single.php for Custom Post Type

I’m trying to design a page template for a custom post type registered as cfd_venue. When I try to access the page via permalink, it does not get picked up by my template file single-cfd_venue.php

Here’s how I register my custom post type:

register_post_type( 'cfd_venue',
    array(
      'labels' => array(
        'name' => __( 'Venues' ),
        'singular_name' => __( 'Venue' ),
        'add_new' => __( 'Add New' ),
        'add_new_item' => __( 'Add New Venue' ),
        'edit' => __( 'Edit' ),
        'edit_new_item' => __( 'Edit New Venue' ),
        'new_item' => __( 'New Venue' ),
        'view' => __( 'View' ),
        'view_item' => __( 'View Venue' ),
        'search_items' => __( 'Search Venues' ),
        'not_found' => __( 'No venues found' ),
        'not_found_in_trash' => __( 'No venues found in Trash' )
      ),
      'public' => true,
      'show_ui' => true,
      'menu_position' => 21,
      'supports' => array('title', 'thumbnail', 'editor')
    )
  );

What am I doing wrong?