diff --git a/firmware/libboard/qmod/source/card_pres.c b/firmware/libboard/qmod/source/card_pres.c
index 0cd34f0..7a32b57 100644
--- a/firmware/libboard/qmod/source/card_pres.c
+++ b/firmware/libboard/qmod/source/card_pres.c
@@ -1,3 +1,21 @@
+/* card presence utilities
+ *
+ * (C) 2016-2017 by Harald Welte <hwelte@hmw-consulting.de>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA
+ */
 #include <osmocom/core/timer.h>
 #include "board.h"
 #include "utils.h"