diff --git a/util/copyrights b/util/copyrights
index a904293954..5207e19958 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -1744,7 +1744,7 @@
 ./lib/dns/include/Makefile.in			MAKE	1998,1999,2000,2001,2004
 ./lib/dns/include/dns/.cvsignore		X	1999,2000,2001
 ./lib/dns/include/dns/Makefile.in		MAKE	1998,1999,2000,2001,2002,2003,2004
-./lib/dns/include/dns/acache.h			C	2004
+./lib/dns/include/dns/acache.h			C	2004,2006
 ./lib/dns/include/dns/acl.h			C	1999,2000,2001,2002,2004,2005,2006
 ./lib/dns/include/dns/adb.h			C	1999,2000,2001,2002,2003,2004,2005
 ./lib/dns/include/dns/bit.h			C	2000,2001,2004,2005