Doctrine\MongoDB\Query\Builder::comment PHP 메소드

Associates a comment to any expression taking a query predicate.

또한 보기: Expr::comment()

또한 보기: http://docs.mongodb.org/manual/reference/operator/query/comment/

public comment ( string $comment )
$comment	string

    public function comment($comment)
    {
        $this->expr->comment($comment);
        return $this;
    }