Zend Form Element Notes

I have built a zend form element for html content (general notes).

class Sistema_Form_Note extends Zend_Form_Element_Xhtml {

    public $helper = 'formNote';

    public function isValid($value){
        return true;
    }

}

It's working fine however it goes as a field and when I go to insert the post data on my database, the index note element appears.

POST array('name' => 'John'
  'note1' => ...); 

How could I remove it without using the removeElement() method on the controller? Is there any way to tell on the class it shouldn't be a "db field"?

Thanks

I figured out, looking how submit button is removed, It can be solved overring contruct method and passing ignore option as true.

class Sistema_Form_Note extends Zend_Form_Element_Xhtml {

    public $helper = 'formNote';

    public function __construct($spec, $options = null)
    {
       if (is_string($spec) && ((null !== $options) && is_string($options))) {
            $options = array('label' => $options);
       }

       if (!isset($options['ignore'])) {
            $options['ignore'] = true;
       }

       parent::__construct($spec, $options);
    }

    public function isValid($value){
       return true;
    }

}