Allow other modules to alter the ingredient units list

For a project that I'm working on I need to add specific units for ingredients quantities.

Instead of doing this in a ugly form alter, I wrote the little patch below that allow other modules to alter the units array via a hook like this :

/**
 * Implements hook_recipe_ing_units_alter.
 * 
 * @param array $units
 */
mymodule_recipe_ing_units_alter(&$units){
 // your units alterations here
}