diff --git a/docs/en/reference/dql-doctrine-query-language.rst b/docs/en/reference/dql-doctrine-query-language.rst
index 6d78482dc..06aaa58ab 100644
--- a/docs/en/reference/dql-doctrine-query-language.rst
+++ b/docs/en/reference/dql-doctrine-query-language.rst
@@ -509,6 +509,8 @@ And then use the ``NEW`` DQL keyword :
     $query = $em->createQuery('SELECT NEW CustomerDTO(c.name, e.email, a.city, SUM(o.value)) FROM Customer c JOIN c.email e JOIN c.address a JOIN c.orders o GROUP BY c');
     $users = $query->getResult(); // array of CustomerDTO
 
+Note that you can only pass scalar expressions to the constructor.
+
 Using INDEX BY
 ~~~~~~~~~~~~~~