diff --git a/core/includes/database.inc b/core/includes/database.inc
index 5cfacd4..6d5318b 100644
--- a/core/includes/database.inc
+++ b/core/includes/database.inc
@@ -321,8 +321,6 @@ function db_query_range($query, $from, $count, array $args = array(), array $opt
  *   The name of the temporary table.
  *
  * @see \Drupal\Core\Database\Connection::defaultOptions()
- *
- * @deprecated in Drupal 8.0.x, will be removed before 8.1.0.
  */
 function db_query_temporary($query, array $args = array(), array $options = array()) {
   if (empty($options['target'])) {
diff --git a/core/lib/Drupal/Core/Database/Query/Select.php b/core/lib/Drupal/Core/Database/Query/Select.php
index 7b7b1ef..2c83194 100644
--- a/core/lib/Drupal/Core/Database/Query/Select.php
+++ b/core/lib/Drupal/Core/Database/Query/Select.php
@@ -573,8 +573,8 @@ public function execute() {
    * {@inheritdoc}
    */
   public function executeTemporary() {
-    // If validation fails, simply return NULL.
-    // Note that validation routines in preExecute() may throw exceptions instead.
+    // If validation fails, simply return NULL. Note that validation routines in
+    // preExecute() may throw exceptions instead.
     if (!$this->preExecute()) {
       return NULL;
     }
diff --git a/core/lib/Drupal/Core/Database/Query/SelectInterface.php b/core/lib/Drupal/Core/Database/Query/SelectInterface.php
index 2847fe3..649446e 100644
--- a/core/lib/Drupal/Core/Database/Query/SelectInterface.php
+++ b/core/lib/Drupal/Core/Database/Query/SelectInterface.php
@@ -489,10 +489,10 @@ public function preExecute(SelectInterface $query = NULL);
   public function execute();
 
   /**
-   * Executes a SELECT query string and saves the result set to a temporary table.
+   * Executes a SELECT query string and saves the results in a temporary table.
    *
-   * @return string
-   *   The name of the temporary table.
+   * @return string|null
+   *   The name of the temporary table, or NULL if the query was not successful.
    */
   public function executeTemporary();