diff --git a/src/ckpmsg.c b/src/ckpmsg.c
index d7408f93..c9763cbe 100644
--- a/src/ckpmsg.c
+++ b/src/ckpmsg.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2018 Con Kolivas
+ * Copyright 2014-2018,2023 Con Kolivas
  * Copyright 2014-2016 Andrew Smith
  *
  * This program is free software; you can redistribute it and/or modify it
diff --git a/src/stratifier.h b/src/stratifier.h
index 0a105163..6a20d4f2 100644
--- a/src/stratifier.h
+++ b/src/stratifier.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2017 Con Kolivas
+ * Copyright 2014-2017,2023 Con Kolivas
  *
  * 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