diff --git a/COPYING b/COPYING
index 9e6d483..0ce5a73 100644
--- a/COPYING
+++ b/COPYING
@@ -6,7 +6,7 @@ This file is Copyrighted
 
     This file is covered under the following Copyright:
 
-	Copyright (C) 1999-2014  Landon Curt Noll
+	Copyright (C) 1999-2021  Landon Curt Noll
 	All rights reserved.
 
 	Everyone is permitted to copy and distribute verbatim copies
diff --git a/Makefile b/Makefile
index a491182..5e2159f 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,8 @@
 #	 USE_READLINE= -DUSE_READLINE
 #	 READLINE_LIB= -lreadline -lhistory -lncurses
 #
+# Copyright (C) 1999-2018,2021  Landon Curt Noll
+#
 # The Makefile.ship makefile becomes the Makefile found in the
 # calc-*.tar.bz2 bzip2 source tarball.
 #
diff --git a/calc.h b/calc.h
index 517c764..92650e5 100644
--- a/calc.h
+++ b/calc.h
@@ -1,7 +1,7 @@
 /*
  * calc - definitions for calculator program
  *
- * Copyright (C) 1999-2007,2014  David I. Bell
+ * Copyright (C) 1999-2007,2014,2021  David I. Bell
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help.c b/help.c
index f3120ec..b48e0ce 100644
--- a/help.c
+++ b/help.c
@@ -1,7 +1,7 @@
 /*
  * help - display help for calc
  *
- * Copyright (C) 1999-2007,2014,2018  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2018,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/lib_calc.c b/lib_calc.c
index 75d045f..2092511 100644
--- a/lib_calc.c
+++ b/lib_calc.c
@@ -1,7 +1,7 @@
 /*
  * lib_calc - calc link library initialization and shutdown routines
  *
- * Copyright (C) 1999-2007,2018  Landon Curt Noll
+ * Copyright (C) 1999-2007,2018,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/lib_calc.h b/lib_calc.h
index 349f73f..0ff023f 100644
--- a/lib_calc.h
+++ b/lib_calc.h
@@ -1,7 +1,7 @@
 /*
  * math_error - a simple libcalc math error routine
  *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License