===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/what/what.1,v
retrieving revision 1.18
retrieving revision 1.19
diff -u -r1.18 -r1.19
--- src/usr.bin/what/what.1	2014/06/03 21:20:40	1.18
+++ src/usr.bin/what/what.1	2015/01/22 19:10:17	1.19
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: what.1,v 1.18 2014/06/03 21:20:40 jmc Exp $
+.\"	$OpenBSD: what.1,v 1.19 2015/01/22 19:10:17 krw Exp $
 .\"	$NetBSD: what.1,v 1.3 1994/11/17 06:59:38 jtc Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"     @(#)what.1	8.1 (Berkeley) 6/6/93
 .\"
-.Dd $Mdocdate: June 3 2014 $
+.Dd $Mdocdate: January 22 2015 $
 .Dt WHAT 1
 .Os
 .Sh NAME
@@ -51,8 +51,20 @@
 or the form
 .Dq @(#)
 as inserted by the source code control system (SCCS).
-It prints the remainder
-of the string following this marker, up to a NUL, newline, double
+.Pp
+When
+.Sq $
+followed by the system name is encountered
+.Nm
+prints the remainder of the string up to a
+.Sq $
+or any non-printable character.
+.Pp
+When
+.Dq @(#)
+is encountered
+.Nm
+prints the remainder of the string, up to a NUL, newline, double
 quote, backslash, or
 .Sq >
 character.
@@ -73,6 +85,10 @@
 X/Open System Interfaces option of the
 .St -p1003.1-2008
 specification.
+.Pp
+Processing $sysname$ sequences is an
+.Ox
+extension.
 .Sh HISTORY
 The
 .Nm