diff --git a/doc/Makefile b/doc/Makefile
index 60a48fdf..aeda78bd 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -14,8 +14,8 @@
 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #
 #   Internet Systems Consortium, Inc.
-#   950 Charter Street
-#   Redwood City, CA 94063
+#   PO Box 360
+#   Newmarket, NH 03857 USA
 #   <info@isc.org>
 #   https://www.isc.org/