diff --git a/core/lib/Drupal/Core/Database/Statement.php b/core/lib/Drupal/Core/Database/Statement.php
index d448532..cbfc351 100644
--- a/core/lib/Drupal/Core/Database/Statement.php
+++ b/core/lib/Drupal/Core/Database/Statement.php
@@ -31,6 +31,26 @@ class Statement extends \PDOStatement implements StatementInterface {
    */
   public $allowRowCount = FALSE;
 
+  /**
+   * Constructs a new Statement object.
+   *
+   * The PDO manual does not document this constructor, but when overriding the
+   * PDOStatement class with a custom without this constructor, PDO will throw
+   * the internal exception/warning:
+   *
+   * "PDO::query(): SQLSTATE[HY000]: General error: user-supplied statement does
+   *  not accept constructor arguments"
+   *
+   * PDO enforces that the access type of this constructor must be protected,
+   * and lastly, it also enforces that a custom PDOStatement interface (like
+   * this) omits the constructor (declaring it results in fatal errors
+   * complaining about "the access type must not be public" if it is public, and
+   * "the access type must be omitted" if it is protected; i.e., conflicting
+   * statements). The access type has to be protected.
+   *
+   * @param \Drupal\Core\Database\Connection $dbh
+   *   The database connection object.
+   */
   protected function __construct(Connection $dbh) {
     $this->dbh = $dbh;
     $this->setFetchMode(\PDO::FETCH_OBJ);
diff --git a/core/lib/Drupal/Core/Database/StatementInterface.php b/core/lib/Drupal/Core/Database/StatementInterface.php
index e0147f4..df7ae86 100644
--- a/core/lib/Drupal/Core/Database/StatementInterface.php
+++ b/core/lib/Drupal/Core/Database/StatementInterface.php
@@ -21,25 +21,6 @@
 interface StatementInterface extends \Traversable {
 
   /**
-   * Constructs a new PDOStatement object.
-   *
-   * The PDO manual does not document this constructor, but when overriding the
-   * PDOStatement class with a custom without this constructor, PDO will throw
-   * the internal exception/warning:
-   *
-   * "PDO::query(): SQLSTATE[HY000]: General error: user-supplied statement does
-   *  not accept constructor arguments"
-   *
-   * PDO enforces that the access type of this constructor must be protected,
-   * and lastly, it also enforces that a custom PDOStatement interface (like
-   * this) omits the constructor (declaring it results in fatal errors
-   * complaining about "the access type must not be public" if it is public, and
-   * "the access type must be omitted" if it is protected; i.e., conflicting
-   * statements). The access type has to be protected.
-   */
-  //protected function __construct(Connection $dbh);
-
-  /**
    * Executes a prepared statement
    *
    * @param $args