diff --git a/share/man/man4/stf.4 b/share/man/man4/stf.4
--- a/share/man/man4/stf.4
+++ b/share/man/man4/stf.4
@@ -57,9 +57,9 @@
 interface.
 The
 .Nm
-interface is necessary for site border router
+interface is necessary for site border routers
 (called
-.Dq 6to4 router
+.Dq 6to4 routers
 or
 .Dq 6rd Customer Edge (CE)
 in the specification).
@@ -306,8 +306,6 @@
 .Xr gif 4 ,
 .Xr inet 4 ,
 .Xr inet6 4
-.Pp
-.Pa http://www.ipv6day.org/action.php?n=En.IPv6day
 .Rs
 .%A Brian Carpenter
 .%A Keith Moore