Yes, that's what I mean. I will change "parameter" to "argument" everywhere.

This is very useful if you want to create a class that satisfies an interface, but wants to expose additional configuration options in that method. For a simple example:

```php
interface ValueBagInterface
{
    public function get($name);
}

class CustomValueBag implements ValueBagInterface
{
    public function get($key, $default = null)
    {
        // ...
    }
}
```

My class can be used anywhere where that interface is expected, but when using the class directly in my code, I can take advantage of the additional argument.