How to exclude namespace/file/method from XML documentation?

In my MVC application I use XML comments in controllers, helpers etc.

public class OrderApiController : BaseApiController
{
    /// <summary>Summary</summary>
    /// <param name="customerId">The ID of current customer.</param>
    public OrderStatusViewModel MakeOrder(Guid customerId)
    {

    }
}

public class SessionHelper
{
    /// <summary>Summary</summary>
    public OrderStatusViewModel GetCurrentUser()
    {

    }
}

But I want to generate XML documentation only for my controllers, so I don't need to include documentation for SessionHelper. Is it possible?