diff --git a/restws.api.php b/restws.api.php
index 9e7e976..1882711 100644
--- a/restws.api.php
+++ b/restws.api.php
@@ -148,6 +148,16 @@ function hook_restws_response_alter(&$response, $function, $formatName) {
 }
 
 /**
+ * Alter the list of allowed meta controls.
+ *
+ * @param array $controls
+ *   A list of allowed meta controlers
+ */
+function hook_restws_meta_controls_alter(&$controls) {
+  $controls['deep-load-refs'] = 'deep-load-refs';
+}
+
+/**
  * @}
  */
 
diff --git a/restws.module b/restws.module
index acfaa6a..3efdd60 100644
--- a/restws.module
+++ b/restws.module
@@ -444,13 +444,15 @@ function restws_module_implements_alter(&$implementations, $hook) {
  * Return all available meta controls.
  */
 function restws_meta_controls() {
-  return array(
+  $controls = array(
     'sort' => 'sort',
     'direction' => 'direction',
     'page' => 'page',
     'limit' => 'limit',
     'full' => 'full',
   );
+  drupal_alter('restws_meta_controls', $controls);
+  return $controls;
 }
 
 /**