diff --git a/core/includes/form.inc b/core/includes/form.inc
index 19993c6..0c7119f 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -1824,6 +1824,7 @@ function form_builder($form_id, &$element, &$form_state) {
     '#required' => FALSE,
     '#attributes' => array(),
     '#title_display' => 'before',
+    '#description_position' => 'after',
   );
 
   // Special handling if we're on the top level form element.
@@ -4623,7 +4624,9 @@ function form_pre_render_file($element) {
  * - form-disabled: Only set if the form element is #disabled.
  *
  * In addition to the element itself, the DIV contains a label for the element
- * based on the optional #title_display property, and an optional #description.
+ * based on the optional #title_display property, and an optional #description,
+ * that can be output before or after the field depending on the
+ * #description_position property.
  *
  * The optional #title_display property can have these values:
  * - before: The label is output before the element. This is the default.
@@ -4649,11 +4652,19 @@ function form_pre_render_file($element) {
  * but the parent element should have neither. Use this carefully because a
  * field without an associated label can cause accessibility challenges.
  *
+ * The optional #description_position property can have these values:
+ *  - before: The description is output before the element.
+ *  - after: The description is output after the element.
+ *
+ * If the #description property is not set, the description will not be output,
+ * regardless of the #description_position value.
+ * The default value of #description_position is 'after'.
+ *
  * @param $variables
  *   An associative array containing:
  *   - element: An associative array containing the properties of the element.
- *     Properties used: #title, #title_display, #description, #id, #required,
- *     #children, #type, #name.
+ *     Properties used: #title, #title_display, #description, #description_position,
+ *     #id, #required, #children, #type, #name.
  *
  * @ingroup themeable
  */
@@ -4664,6 +4675,7 @@ function theme_form_element($variables) {
   // may not necessarily have been processed by form_builder().
   $element += array(
     '#title_display' => 'before',
+    '#description_position' => 'after',
   );
 
   // Take over any #wrapper_attributes defined by the element.
@@ -4701,10 +4713,16 @@ function theme_form_element($variables) {
     case 'before':
     case 'invisible':
       $output .= ' ' . theme('form_element_label', $variables);
+      if (!empty($element['#description']) && $element['#description_position'] == 'before') {
+        $output .= '<div class="description">' . $element['#description'] . "</div>\n";
+      }
       $output .= ' ' . $prefix . $element['#children'] . $suffix . "\n";
       break;
 
     case 'after':
+      if (!empty($element['#description']) && $element['#description_position'] == 'before') {
+        $output .= '<div class="description">' . $element['#description'] . "</div>\n";
+      }
       $output .= ' ' . $prefix . $element['#children'] . $suffix;
       $output .= ' ' . theme('form_element_label', $variables) . "\n";
       break;
@@ -4715,8 +4733,7 @@ function theme_form_element($variables) {
       $output .= ' ' . $prefix . $element['#children'] . $suffix . "\n";
       break;
   }
-
-  if (!empty($element['#description'])) {
+  if (!empty($element['#description']) && $element['#description_position'] == 'after') {
     $attributes = array('class' => 'description');
     if (!empty($element['#id'])) {
       $attributes['id'] = $element['#id'] . '--description';
diff --git a/core/modules/system/system.api.php b/core/modules/system/system.api.php
index 8ddbf09..5ff3b41 100644
--- a/core/modules/system/system.api.php
+++ b/core/modules/system/system.api.php
@@ -287,6 +287,8 @@ function hook_queue_info_alter(&$queues) {
  *  - "#submit": array of callback functions taking $form and $form_state.
  *  - "#title_display": optional string indicating if and how #title should be
  *    displayed, see theme_form_element() and theme_form_element_label().
+ *  - "#description_position": optional string indicating how the #description should
+ *    be displayed, see theme_form_element().
  *
  * @see hook_element_info_alter()
  * @see system_element_info()