diff --git a/lib/libc/string/Makefile.inc b/lib/libc/string/Makefile.inc
index 8dd10929da6c..77d63a02ea76 100644
--- a/lib/libc/string/Makefile.inc
+++ b/lib/libc/string/Makefile.inc
@@ -28,7 +28,7 @@ MAN+=	bcmp.3 bcopy.3 bstring.3 bzero.3 ffs.3 index.3 memccpy.3 memchr.3 \
 	memcmp.3 memcpy.3 memmove.3 memset.3 rindex.3 strcasecmp.3 strcat.3 \
 	strchr.3 strcmp.3 strcoll.3 strcpy.3 strcspn.3 strdup.3 strerror.3 \
 	string.3 strlcpy.3 strlen.3 strmode.3 strpbrk.3 strrchr.3 strsep.3 \
-	strspn.3 strstr.3 strtok.3 strxfrm.3 swab.3 wmemchr.3
+	strspn.3 strstr.3 strtok.3 strxfrm.3 swab.3 wcswidth.3 wmemchr.3
 
 MLINKS+=strcasecmp.3 strncasecmp.3
 MLINKS+=strcat.3 strncat.3
diff --git a/lib/libc/string/wcswidth.3 b/lib/libc/string/wcswidth.3
new file mode 100644
index 000000000000..ea63b8c1c1ba
--- /dev/null
+++ b/lib/libc/string/wcswidth.3
@@ -0,0 +1,61 @@
+.\" Copyright (c) 2002 Tim J. Robbins
+.\" All rights reserved.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.Dd August 8, 1999
+.Dt WCSWIDTH 3
+.Os
+.Sh NAME
+.Nm wcswidth
+.Nd "number of column positions in wide-character string"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In wchar.h
+.Ft int
+.Fn wcswidth "const wchar_t *pwcs" "size_t n"
+.Sh DESCRIPTION
+The
+.Fn wcswidth
+function determines the number of column positions required for the first
+.Fa n
+characters of
+.Fa pwcs ,
+or until a null wide character (L'\e0') is encountered.
+.Sh RETURN VALUES
+The
+.Fn wcswidth
+function returns 0 if
+.Fa pwcs
+is an empty string (L""),
+-1 if a non-printing wide character is encountered,
+otherwise it returns the number of column positions occupied.
+.Sh SEE ALSO
+.Xr iswprint 3 ,
+.Xr wcwidth 3
+.Sh STANDARDS
+The
+.Fn wcswidth
+function conforms to
+.St -p1003.1-2001 .