[solved]How can I catch a hook? (admin pages -> orders -> an order)

[E.D.]

I write a module, which does this:

- watch the Admin pages -> Orders -> An Order

- if this order's OrderStatus is updating then sends a post

But how could I catch the updateOrderStatus hook?

This is correct?

class MiroxRendelesExport extends Module
{
...
   public function hookUpdateOrderStatus()
       {
       file_put_contents("test.txt", "aassdd");
       ...
       }

Or do I use other extend? But what?

[E.D.]

Argh... I'm an idiot!

I wrote this into the code:

public function install()
       {
       parent::install();

       if (!$this->registerHook('updateOrderStatus'))
           {
           return false;
           }
       }

And I updated this code to my PrestaShop server (ftp copy).
But I didn't click on "Uninstall" and then neither "Install" button in the "Admin pages -> Modules page"
...well, the problem solved... Only I should click on "Uninstall" and then "Install" button

Thank you for your attention!