diff --git a/acdx_entityreference/acdx_entityreference.module b/acdx_entityreference/acdx_entityreference.module
index d673a3d..7b3036f 100644
--- a/acdx_entityreference/acdx_entityreference.module
+++ b/acdx_entityreference/acdx_entityreference.module
@@ -84,6 +84,13 @@ function acdx_entityreference_field_widget_settings_form($field, $instance) {
       '#options' => $options,
       '#default_value' => isset($settings['create_bundle']) ? $settings['create_bundle'] : NULL,
     );
+    $form['min_length'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Mininum length.'),
+      '#description' => t('The minimum length of characters to enter to open the suggestion list.'),
+      '#default_value' => isset($settings['min_length']) ? $settings['min_length'] : 0,
+      '#element_validate' => array('_element_validate_integer'),
+    );
   }
 
   return $form;
@@ -141,6 +148,7 @@ function acdx_entityreference_field_widget_form(&$form, &$form_state, $field, $i
         '#autocomplete_deluxe_path' => url($path . '/' . $field['field_name'] . '/' . $instance['entity_type'] . '/' . $instance['bundle'], array('absolute' => TRUE)),
         '#size' => $instance['widget']['settings']['size'],
         '#element_validate' => array('_entityreference_autocomplete_validate'),
+        '#min_length' => isset($instance['widget']['settings']['min_length']) ? $instance['widget']['settings']['min_length'] : 0,
       );
       if ($instance['widget']['type'] == 'entityreference_autocomplete_deluxe') {
         return array('target_id' => $element);