diff --git a/src/ReplaceTextHooks.php b/src/ReplaceTextHooks.php
index dc5604e4..84452dc1 100644
--- a/src/ReplaceTextHooks.php
+++ b/src/ReplaceTextHooks.php
@@ -1,6 +1,23 @@
 <?php
 /**
  * Hook functions for the Replace Text extension.
+ *
+ * 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
  */
 
 class ReplaceTextHooks {
diff --git a/src/ReplaceTextJob.php b/src/ReplaceTextJob.php
index 2aca8c7f..281fdb04 100644
--- a/src/ReplaceTextJob.php
+++ b/src/ReplaceTextJob.php
@@ -1,13 +1,30 @@
 <?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 Yaron Koren
+ * @author Ankit Garg
+ */
 
 use Wikimedia\ScopedCallback;
 
 /**
  * Background job to replace text in a given page
  * - based on /includes/RefreshLinksJob.php
- *
- * @author Yaron Koren
- * @author Ankit Garg
  */
 class ReplaceTextJob extends Job {
 	/**
diff --git a/src/ReplaceTextSearch.php b/src/ReplaceTextSearch.php
index d4dcab08..712210f6 100644
--- a/src/ReplaceTextSearch.php
+++ b/src/ReplaceTextSearch.php
@@ -1,4 +1,22 @@
 <?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
+ */
 
 use Wikimedia\Rdbms\Database;
 use Wikimedia\Rdbms\IResultWrapper;
diff --git a/src/ReplaceTextUtils.php b/src/ReplaceTextUtils.php
index 3adbe5be..796e366e 100644
--- a/src/ReplaceTextUtils.php
+++ b/src/ReplaceTextUtils.php
@@ -1,4 +1,22 @@
 <?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
+ */
 
 use \MediaWiki\MediaWikiServices;
 
diff --git a/src/SpecialReplaceText.php b/src/SpecialReplaceText.php
index 273872d0..74536679 100644
--- a/src/SpecialReplaceText.php
+++ b/src/SpecialReplaceText.php
@@ -1,4 +1,22 @@
 <?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
+ */
 
 class SpecialReplaceText extends SpecialPage {
 	private $target;