diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
index d09e2b2f450..98a4279765d 100644
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -65,6 +65,7 @@
 .Nm
 .Fl l
 .Op Fl du
+.Op Fl g Ar groupname
 .Op Ar address_family
 .Nm
 .Op Fl dkLmuv