How to Hide the "Adminimize" Admin Menu

function plt_hide_adminimize_menus() {
	//Hide the "Settings → Adminimize" menu.
	remove_submenu_page('options-general.php', 'adminimize-options');
}

add_action('admin_menu', 'plt_hide_adminimize_menus', 100000);

Where do I put this code?