un-violate the GPL

rpc/RunSingleJob.php

@@ -1,4 +1,25 @@
 <?php
+/**
+ * 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.
+ *
+ * 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
+ * @author Aaron Schulz
+ * @author Marko Obrovac
+ * @link https://phabricator.wikimedia.org/source/mediawiki-config/browse/master/rpc/RunSingleJob.php
+ */
 
 use MediaWiki\Extension\EventBus\JobExecutor;
 use MediaWiki\MediaWikiServices;