add a note about shell built-ins;

1 files changed, 16 insertions, 2 deletions

diff --git a/usr.bin/man/help.1 b/usr.bin/man/help.1
index f8f4492f21e..2ed3ce75a99 100644
--- a/usr.bin/man/help.1
+++ b/usr.bin/man/help.1
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: help.1,v 1.9 2008/01/03 17:33:49 jmc Exp $
+.\"	$OpenBSD: help.1,v 1.10 2008/01/11 20:32:52 jmc Exp $
 .\"
 .\" Copyright (c) 1999 Aaron Campbell
 .\" All rights reserved.
@@ -24,7 +24,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: January 3 2008 $
+.Dd $Mdocdate: January 11 2008 $
 .Dt HELP 1
 .Os
 .Sh NAME
@@ -165,10 +165,24 @@ environment variable (see
 If the command is not found, an error message is printed.
 Otherwise, the shell runs the command, passing it any arguments specified on
 the command line.
+.Pp
+Shell built-in commands do not have their own manual page,
+so it's necessary to read the manual page for the user's shell.
+Tools such as
+.Xr which 1
+and
+.Dq whence ,
+a
+.Xr ksh 1
+built-in command,
+can be used to see what commands are being executed.
 .Sh SEE ALSO
+.Xr csh 1 ,
+.Xr ksh 1 ,
 .Xr man 1 ,
 .Xr whatis 1 ,
 .Xr whereis 1 ,
+.Xr which 1 ,
 .Xr afterboot 8
 .Sh HISTORY
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