There is some JPA entity with named queries, as example:

@Entity
@Table(name = "USERS")
@NamedQueries({
    @NamedQuery(name = "testQuery", query = "SELECT u from User u WHERE u.id = :id")
})
public class User implements Serializable {
...
}

And in another place (as example in DAO layer) there is some code uses this query:

entityManager.createNamedQuery("testQuery");

So, the main idea of this enhancement is navigation to named query declaration by Ctrl+Click on named query name in place, where query i used.