Versioning for custom resources

services.versions.api.php claims that you can add versioning by creating update functions in the following format: _{RESOURCE_NAME}_resource_{METHOD_NAME}_update_{MAJOR_VERSION}_{MINOR_VERSION}

Perhaps I'm missing something, but this seems to only work for core resources, as those are the only ones loaded by services_get_updates() ...

function services_get_updates() {
  $updates = &drupal_static(__FUNCTION__, array());
  if (!isset($updates) || empty($updates)) {
    $updates = array();
    module_load_include('resource_build.inc', 'services');
    // Load the resources for services.
    _services_core_resources();
    ...

function _services_core_resources() {
  module_load_include('inc', 'services', 'resources/comment_resource');
  module_load_include('inc', 'services', 'resources/file_resource');
  module_load_include('inc', 'services', 'resources/node_resource');
  module_load_include('inc', 'services', 'resources/system_resource');
  module_load_include('inc', 'services', 'resources/taxonomy_resource');
  module_load_include('inc', 'services', 'resources/user_resource');

  $resources = array(
    '#api_version' => 3002,
  );  

  $resources += _comment_resource_definition();
  $resources += _file_resource_definition();
  $resources += _node_resource_definition();
  $resources += _system_resource_definition();
  $resources += _taxonomy_resource_definition();
  $resources += _user_resource_definition();

  return $resources;
}