How to Hide the "Gzip Compression" Admin Menu

function plt_hide_enable_gzip_compression_menus() {
	//Hide the "Settings → Gzip Compression" menu.
	remove_submenu_page('options-general.php', 'gzip-compression');
}

add_action('admin_menu', 'plt_hide_enable_gzip_compression_menus', 11);

Where do I put this code?