Change title's placeholder text for custom post type "projekti"

gistfile1.php

// ****************************************************
// Change title's placeholder text for custom post type "projekti"
// ****************************************************
function change_default_title_event( $title ){
     $screen = get_current_screen();

     if  ( 'projekti' == $screen->post_type ) {
          $title = 'Projektin otsikko...';
     }

     return $title;
}

add_filter( 'enter_title_here', 'change_default_title_event' );