Document that some sorts uses -b w/o key fields.

1 files changed, 12 insertions, 1 deletions

diff --git a/usr.bin/sort/sort.1 b/usr.bin/sort/sort.1
index 7d927290254..c1c9f21e89f 100644
--- a/usr.bin/sort/sort.1
+++ b/usr.bin/sort/sort.1
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sort.1,v 1.53 2015/04/05 13:56:04 millert Exp $
+.\"	$OpenBSD: sort.1,v 1.54 2015/04/05 14:20:22 millert Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -585,6 +585,17 @@ Some are provided for compatibility with GNU
 .Nm ,
 others are specific to this implementation.
 .Pp
+Some implementations of
+.Nm
+honor the
+.Fl b
+option even when no key fields are specified.
+This implementation follows historic practice and
+.St -p1003.1-2008
+in only honoring
+.Fl b
+when it precedes a key field.
+.Pp
 The historic practice of allowing the
 .Fl o
 option to appear after the