Change placeholder text for "Enter title here" on a custom post type

wp_custom_title_placeholder_text.php

<?php

/* 
replacing the default "Enter title here" placeholder text in the title input box
with something more descriptive can be helpful for custom post types 

place this code in your theme's functions.php or relevant file

source: http://flashingcursor.com/wordpress/change-the-enter-title-here-text-in-wordpress-963
*/

function change_default_title( $title ){

    $screen = get_current_screen();

    if ( 'your_custom_post_type' == $screen->post_type ){
        $title = 'Your custom placeholder text';
    }

    return $title;
}

add_filter( 'enter_title_here', 'change_default_title' );

?>