===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/fmt/fmt.1,v
retrieving revision 1.27
retrieving revision 1.28
diff -c -r1.27 -r1.28
*** src/usr.bin/fmt/fmt.1	2015/09/11 19:20:18	1.27
--- src/usr.bin/fmt/fmt.1	2015/12/15 16:26:17	1.28
***************
*** 1,4 ****
! .\" $OpenBSD: fmt.1,v 1.27 2015/09/11 19:20:18 schwarze Exp $
  .\"
  .\" Copyright (c) 1980, 1990, 1993
  .\"	The Regents of the University of California.  All rights reserved.
--- 1,4 ----
! .\" $OpenBSD: fmt.1,v 1.28 2015/12/15 16:26:17 schwarze Exp $
  .\"
  .\" Copyright (c) 1980, 1990, 1993
  .\"	The Regents of the University of California.  All rights reserved.
***************
*** 29,35 ****
  .\"
  .\"     @(#)fmt.1	8.1 (Berkeley) 6/6/93
  .\"
! .Dd $Mdocdate: September 11 2015 $
  .Dt FMT 1
  .Os
  .Sh NAME
--- 29,35 ----
  .\"
  .\"     @(#)fmt.1	8.1 (Berkeley) 6/6/93
  .\"
! .Dd $Mdocdate: December 15 2015 $
  .Dt FMT 1
  .Os
  .Sh NAME
***************
*** 139,144 ****
--- 139,157 ----
  evening the lines:
  .Pp
  .Dl !}fmt
+ .Sh ENVIRONMENT
+ .Bl -tag -width LC_CTYPE
+ .It Ev LC_CTYPE
+ The character set
+ .Xr locale 1 .
+ It is used to decide which byte sequences form characters and what
+ their display width is.
+ If it is unset or set to
+ .Qq C ,
+ .Qq POSIX,
+ or an unsupported value, each byte except the tab is assumed
+ to represent a character of display width 1.
+ .El
  .Sh EXIT STATUS
  .Ex -std
  The latter happens with invalid options, insufficient memory,