diff --git a/core/update.php b/core/update.php
index 658d0f9..fb5d991 100644
--- a/core/update.php
+++ b/core/update.php
@@ -47,7 +47,7 @@ if (version_compare(PHP_VERSION, '5.3.3') < 0) {
 define('MAINTENANCE_MODE', 'update');
 
 /**
- * @todo NEEDS FUNCTION DEFINITION
+ * Renders form with a list of available database updates.
  */
 function update_selection_page() {
   drupal_set_title('Drupal database update');
@@ -59,7 +59,7 @@ function update_selection_page() {
   return $output;
 }
 /**
- * @todo NEEDS FUNCTION DEFINITION
+ * Form constructor for the list of available database module updates.
  */
 function update_script_selection_form($form, &$form_state) {
   $count = 0;
@@ -163,7 +163,7 @@ function update_script_selection_form($form, &$form_state) {
 }
 
 /**
- * @todo NEEDS FUNCTION DEFINITION
+ * Provides links to homepage and administration pages.
  */
 function update_helpful_links() {
   $links['front'] = array(
@@ -180,7 +180,7 @@ function update_helpful_links() {
 }
 
 /**
- * @todo NEEDS FUNCTION DEFINITION
+ * Displays results of update script with any accompanying errors.
  */
 function update_results_page() {
   drupal_set_title('Drupal database update');