diff --git a/lib/libc/gen/ttyname.3 b/lib/libc/gen/ttyname.3
index 4d34c2424e88..42645dda1bdc 100644
--- a/lib/libc/gen/ttyname.3
+++ b/lib/libc/gen/ttyname.3
@@ -1,4 +1,4 @@
-.\"	$NetBSD: ttyname.3,v 1.22 2011/04/25 22:38:34 wiz Exp $
+.\"	$NetBSD: ttyname.3,v 1.23 2012/05/31 23:11:35 joerg Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)ttyname.3	8.1 (Berkeley) 6/4/93
 .\"
-.Dd June 25, 2008
+.Dd June 1, 2012
 .Dt TTYNAME 3
 .Os
 .Sh NAME
@@ -50,7 +50,7 @@
 .Fn isatty "int fd"
 .In stdlib.h
 .Ft int
-.Fn ttyslot
+.Fn ttyslot "void"
 .Sh DESCRIPTION
 These functions operate on the system file descriptors for terminal
 type devices.