Set attribute as foreign key ebean intellij

Question

I have the following class:

    @Entity
public class exemplo extends Model {

    @Id
    private Integer id_nome;
    private String Designacao_PT;
    private String Nota_PT;

    public exemplo(Integer id_nome,String Designacao_PT,String Nota_PT){

        this.id_nome= id_nome;
        this.Designacao_PT = Designacao_PT;
        this.Nota_PT = Nota_PT;
    }
}

This way the primary key is 'id_name'. If I want to put Designacao_pt as a foreign key how can I do?

I’ve seen something about @joinColumn but I haven’t quite figured it out yet. I’m programming on Intellij 14.0.2