Index: modules/optionwidgets/optionwidgets.module
===================================================================
--- modules/optionwidgets/optionwidgets.module  (revision 773)
+++ modules/optionwidgets/optionwidgets.module  (working copy)
@@ -401,6 +401,7 @@
 function optionwidgets_options($field, $flatten = TRUE) {
   $function = $field['module'] .'_allowed_values';
   $options = function_exists($function) ? $function($field) : (array) content_allowed_values($field, $flatten);
+  drupal_alter('content_allowed_values', $options, $field);
   // Add an empty choice for :
   // - non required radios
   // - non required selects