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diff --git a/lib/libc/stdio/perror.3 b/lib/libc/stdio/perror.3
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+.\"	$NetBSD: perror.3,v 1.4 1995/07/03 22:49:10 jtc Exp $
+.\"
+.\" Copyright (c) 1980, 1991 Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)strerror.3	6.9 (Berkeley) 6/29/91
+.\"
+.Dd June 29, 1991
+.Dt PERROR 3
+.Os BSD 4
+.Sh NAME
+.Nm perror
+.Nd write error messages to standard error
+.Sh SYNOPSIS
+.Fd #include <stdio.h>
+.Ft void
+.Fn perror "const char *string"
+.Sh DESCRIPTION
+The
+.Fn perror
+function looks up the language-dependent error message string affiliated
+with an error number and writes it, followed by a new-line, to the
+standard error stream.
+.Pp
+If the argument
+.Fa string
+is
+.Pf non- Dv NULL
+it is prepended to the message string and separated from it by
+a colon and a space
+.Pq Ql \&:\ \& .
+If
+.Fa string
+is
+.Dv NULL
+only the error message string is printed.
+.Pp
+The contents of the error message string is the same as those returned by
+.Fn strerror
+with argument
+.Fa errno .
+.Sh SEE ALSO
+.Xr intro 2 ,
+.Xr psignal 3 ,
+.Xr setlocale 3 ,
+.Xr strerror 3
+.Sh STANDARDS
+The
+.Fn perror
+function conforms to
+.St -ansiC .