diff --git a/modules/user/user.module b/modules/user/user.module
index 2c02f8c..4b4f3b6 100644
--- a/modules/user/user.module
+++ b/modules/user/user.module
@@ -1513,15 +1513,33 @@ function theme_user_list($variables) {
   return theme('item_list', array('items' => $items, 'title' => $title));
 }
 
+/**
+ * Determines if the current user is anonymous.
+ *
+ * @return bool
+ *   TRUE if the user is anonymous, FALSE if the user is authenticated.
+ */
 function user_is_anonymous() {
   // Menu administrators can see items for anonymous when administering.
   return !$GLOBALS['user']->uid || !empty($GLOBALS['menu_admin']);
 }
 
+/**
+ * Determines if the current user is logged in.
+ *
+ * @return bool
+ *   TRUE if the user is logged in, FALSE if the user is anonymous.
+ */
 function user_is_logged_in() {
   return (bool) $GLOBALS['user']->uid;
 }
 
+/**
+ * Determines if the current user has access to the user registration page.
+ *
+ * @return bool
+ *   TRUE if the user is not already logged in and can register for an account.
+ */
 function user_register_access() {
   return user_is_anonymous() && variable_get('user_register', USER_REGISTER_VISITORS_ADMINISTRATIVE_APPROVAL);
 }