--- /dev/null
+/**
+ * Implements hook_field_widget_info_alter().
+ */
+function {{ machine_name }}_field_widget_info_alter(&$info) {
+ // Add a setting to a widget type.
+ $info['text_textfield']['settings'] += array(
+ 'mymodule_additional_setting' => 'default value',
+ );
+
+ // Let a new field type re-use an existing widget.
+ $info['options_select']['field types'][] = 'my_field_type';
+}