diff --git a/util/copyrights b/util/copyrights
index 1be57da95a..d5a1352a41 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -153,7 +153,7 @@
 ./bin/named/main.c				C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013
 ./bin/named/named.8				MAN	DOCBOOK
 ./bin/named/named.conf.5			MAN	DOCBOOK
-./bin/named/named.conf.docbook			SGML	2004,2005,2006,2007,2008,2012
+./bin/named/named.conf.docbook			SGML	2004,2005,2006,2007,2008,2012,2013
 ./bin/named/named.conf.html			HTML	DOCBOOK
 ./bin/named/named.docbook			SGML	2000,2001,2003,2004,2005,2006,2007,2008,2009,2012
 ./bin/named/named.html				HTML	DOCBOOK