Magento disable user subscribe success email notification

Params:
Magento 1.6.0

Problem:
In Magento admin you can not disable email notification when user subscribe.  So, look to this solution

Solution:
Find script:
/app/code/core/Mage/Newsletter/Model/Subscriber.php
and comment folloving line in function subscribe($email) :
$this->sendConfirmationSuccessEmail();


PS:
This is bad solution, because  when you upgrade your store to the new version
those changes will be overwritten. If you not so lazy, create package for yourself ;)