On delete cascade with doctrine2

I'm trying to make a simple example in order to learn how to delete a row from a parent table and automatically delete the matching rows in the child table using Doctrine2. Here are the two entities I'm using: Child.php: <?php namespace Acme\CascadeBundle\Entity; use Doctrine\ORM\Mapping as ORM; /** * @ORM\Entity * @ORM\Table(name="child") */ class Child { /** * @ORM\Id * @ORM\Column(type="integer") * @ORM\GeneratedValue(strategy="AUTO") */ private $id; /** * @ORM\ManyToOne(targetEntity="Father", cascade={"remove"}) * * @ORM\JoinColumns({ * @ORM\JoinColumn(name="father_id", referencedColumnName="id") * }) * * @var father */ private $father; } Father.php <?php namespace Acme\CascadeBundle\Entity; use Doctrine\ORM\Mapping as ORM; /** * @ORM\Entity * @ORM\Table(name="father") */ class Father { /** * @ORM\Id * @ORM\Column(type="integer") * @ORM\GeneratedValue(strategy="AUTO") */ private $id; } The tables are correctly created on the database, but the On Delete Cascade option it's not created. What am I doing wrong?