diff --git a/src/inc/validations.php b/src/inc/validations.php
index d3c310f..2b063f9 100644
--- a/src/inc/validations.php
+++ b/src/inc/validations.php
@@ -1,4 +1,23 @@
 <?php
+/*
+ * hores
+ * Copyright (c) 2023 Adrià Vilanova Martínez
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.
+ * If not, see http://www.gnu.org/licenses/.
+ */
+
 class validations {
   const DEFAULT_REMINDER_GRACE_PERIOD = 3; // When sending email notifications about pending elements to verify,
                                    // only elements effective until the current day minus the grace period