diff --git a/doc/orgcard.tex b/doc/orgcard.tex
index f78cb88f1..a4400e727 100644
--- a/doc/orgcard.tex
+++ b/doc/orgcard.tex
@@ -15,7 +15,7 @@
 \pdflayout=(0l)
 
 % Nothing else needs to be changed below this line.
-% Copyright (C) 1987, 1993, 1996-1997, 2001-2021 Free Software
+% Copyright (C) 1987, 1993, 1996--1997, 2001--2021 Free Software
 % Foundation, Inc.
 
 % This document is free software: you can redistribute it and/or modify