diff --git a/ApiQueryReferences.php b/ApiQueryReferences.php
index 459c36194..f5baa077c 100644
--- a/ApiQueryReferences.php
+++ b/ApiQueryReferences.php
@@ -1,12 +1,26 @@
 <?php
-
 /**
  * Expose reference information for a page via prop=references API.
  *
- * @see https://www.mediawiki.org/wiki/Extension:Cite#API
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
  *
- * @license WTFPL 2.0
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @see https://www.mediawiki.org/wiki/Extension:Cite#API
  */
+
 class ApiQueryReferences extends ApiQueryBase {
 
 	public function __construct( $query, $moduleName ) {