diff --git a/mk/defaults/options.description b/mk/defaults/options.description
index 1800130aea96..2e291c6ab7a3 100644
--- a/mk/defaults/options.description
+++ b/mk/defaults/options.description
@@ -33,6 +33,7 @@ avahi-howl		Enable howl compatibility in avahi.
 bacula-static		Enable building of statically linked versions of the Bacula daemons
 batch			Enable batch mode support.
 bdb			Enable Berkeley DB support.
+bind-dig-sigchase	Enable dig(1) option +sigchase for DNSSEC signature chasing.
 bind-xml-statistics-server	Enable building in the statistics server in bind95 and later.
 bittorrent		Enable bittorrent support
 blender-exppython	Enable the Experimental Python support.