@juanmf Can you re-word this paragraph please?

>
When using a Doctrine event listener or subscriber, when you make changes to your entity, the `preUpdate()` callback must have an extra line of code to tell Doctrine about the change:

```php
    public function preUpdate(PreUpdateEventArgs $args)
    {
        $entity = $args->getEntity();
        // do all the file uploading logic
        // ...
        $entity->setFilename($newFilename);
        $args->setNewValue('filename', $newFilename);
    }
```

>
For more details on ``preUpdate`` restrictions, see `preUpdate`_ in the in the
Doctrine Events documentation.