no, it needs to be on the (prototyped) array node builder, not the array children builder. So:
````php
->prototype('array')
    ->fixXmlConfig('option')
    ->children()
        // ...
        ->arrayNode('options')
            // ...
        ->end() // options
    ->end()
->end()
````
And if you really want to place it before the options node:
````php
->prototype('array')
    ->children()
        // ...
    ->end()
    ->fixXmlConfig('option')
    ->children()
        ->arrayNode('options')
            // ...
        ->end() // options
    ->end()
->end()
````