diff --git a/core/includes/form.inc b/core/includes/form.inc
index 8b1a7d2..d73dbd3 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -2239,32 +2239,32 @@ function form_type_checkbox_value($element, $input = FALSE) {
 }
 
 /**
- * Form value callback to determine the value for a radios form element.
+ * Form value callback: Determines the value for a radio form element.
  *
  * @param $element
  *   The form element whose value is being populated.
  * @param $input
- *   The incoming input to populate the form element. If this is FALSE, the
- *   element's default value is returned.
+ *   (optional) The incoming input to populate the form element. If FALSE, the
+ *   element's default value is returned. Defaults to FALSE.
  *
  * @return
  *   The data that will appear in the $element_state['values'] collection for
- *   this element. If NULL is returned and #has_garbage_value is not set then
- *   it will automatically attempt to use default value or ''.
- */
+ *   this element.
+*/
 function form_type_radios_value(&$element, $input = FALSE) {
-  // If there is data coming from form submission.
+  // If there is data from a form submission, use that.
   if ($input !== FALSE) {
     // Check if the user submission had no value for this element.
     if (!isset($input)) {
       // Flag as a garbage value so that form builder will not automatically
-      // replace the our NULL with an empty string.
+      // replace the NULL value with an empty string.
       $element['#has_garbage_value'] = TRUE;
       // There was a user submission so validation is a must. This way, the
       // required checker will produce an error as necessary.
       $element['#needs_validation'] = TRUE;
     }
-    // The value stays the same, but the flags above will process it properly.
+    // The value stays the same, but the flags above will ensure it is
+    // processed properly.
     return $input;
   }