filter h1 tag to add a word at the beginning of the text

This is my solution:

add_filter( 'the_title', 'change_title', 10, 2 );   
function change_title( $title, $postid ) {

    global $post;

    if( get_post_type() == MYPOSTTYPE && $title == $post->post_title ){            

        $title = "MYKEYWORD ".$title;            
    }

    return $title;
}