wpmu_options action-hook . WP 3.0.0
Fires at the end of the Network Settings form, before the submit button.
Usage
add_action( 'wpmu_options', 'action_function_name_7656' );
function action_function_name_7656(){
// action...
}Where the hook is called
In file: /wp-admin/network/settings.php
wp-admin/network/settings.php 517
do_action( 'wpmu_options' );