diff --git a/util/copyrights b/util/copyrights
index f8e7d1af6e..ab1e13db84 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -1646,7 +1646,7 @@
 ./lib/dns/include/dns/db.h			C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009
 ./lib/dns/include/dns/dbiterator.h		C	1999,2000,2001,2004,2005,2006,2007
 ./lib/dns/include/dns/dbtable.h			C	1999,2000,2001,2004,2005,2006,2007
-./lib/dns/include/dns/diff.h			C	2000,2001,2004,2005,2006,2007,2008,2009
+./lib/dns/include/dns/diff.h			C	2000,2001,2004,2005,2006,2007,2008,2009,2010
 ./lib/dns/include/dns/dispatch.h		C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009
 ./lib/dns/include/dns/dlz.h			C.PORTION	1999,2000,2001,2005,2006,2007,2009
 ./lib/dns/include/dns/dnssec.h			C	1999,2000,2001,2002,2004,2005,2006,2007,2009