diff --git a/src/cksum.c b/src/cksum.c
index 336ed79..28f2c20 100644
--- a/src/cksum.c
+++ b/src/cksum.c
@@ -1,5 +1,5 @@
 /* $Id$ */
-/* Copyright (c) 2009 Pierre Pronchery <khorben@defora.org> */
+/* Copyright (c) 2005-2020 Pierre Pronchery <khorben@defora.org> */
 /* This file is part of DeforaOS Unix utils */
 /* 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
diff --git a/src/cmp.c b/src/cmp.c
index b712bfe..b2d0663 100644
--- a/src/cmp.c
+++ b/src/cmp.c
@@ -1,5 +1,5 @@
 /* $Id$ */
-/* Copyright (c) 2009 Pierre Pronchery <khorben@defora.org> */
+/* Copyright (c) 2004-2020 Pierre Pronchery <khorben@defora.org> */
 /* This file is part of DeforaOS Unix utils */
 /* 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
diff --git a/src/date.c b/src/date.c
index 8a8b3d4..eca8804 100644
--- a/src/date.c
+++ b/src/date.c
@@ -1,5 +1,5 @@
 /* $Id$ */
-/* Copyright (c) 2014 Pierre Pronchery <khorben@defora.org> */
+/* Copyright (c) 2014-2020 Pierre Pronchery <khorben@defora.org> */
 /* This file is part of DeforaOS Unix utils */
 /* 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
diff --git a/src/df.c b/src/df.c
index 5d8f68e..bc7ae22 100644
--- a/src/df.c
+++ b/src/df.c
@@ -1,5 +1,5 @@
 /* $Id$ */
-/* Copyright (c) 2006-2013 Pierre Pronchery <khorben@defora.org> */
+/* Copyright (c) 2006-2020 Pierre Pronchery <khorben@defora.org> */
 /* This file is part of DeforaOS Unix utils */
 /* 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