Match the reality. The man page was completely wrong.

usr.bin/nice/nice.1

@@ -1,7 +1,6 @@
 .\" Copyright (c) 1980, 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
 .\"
-.\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
 .\" are met:
@@ -31,6 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"	@(#)nice.1	8.1 (Berkeley) 6/6/93
+.\"	$Id$
 .\"
 .Dd June 6, 1993
 .Dt NICE 1
@@ -51,25 +51,46 @@ at a low priority.
 (Think of low and slow).
 If
 .Fl Ns Ar number
-is specified, and if it is greater than or equal
-to 10 (the default),
-.Nm nice
+is not given
+.Nm 
+assumed the value 10.
+The priority is a value in the range -20 to 20. The default priority
+is 0, priority 20 is the lowest possible. 
+.Nm Nice
 will execute
 .Ar command
-at that priority.
-The upper bound, or lowest priority that
-.Nm nice
-will run a command is 20.
-The lower bounds or
-higher priorities (integers less than 10)
-can only be requested by the super-user.
+at priority
+.Ar number
+relative to the priority
+of 
+.Nm nice .
+Higher priorities than the
+current process priority can only requested by the
+super-user. 
 Negative numbers are expressed as
 .Fl - Ns Ar number .
 .Pp
 The returned exit status is the exit value from the
 command executed by
 .Nm nice .
+.Sh EXAMPLES
+.Pp
+$ nice -5 date
+.Pp
+Execute command 
+.Sq date 
+at priority 5 assuming the priority of the
+shell is 0.
+.Pp
+# nice -16 nice --35 date
+.Pp
+Execute command 
+.Sq date 
+at priority -19 assuming the priority of the
+shell is 0 and you are the super-user.
 .Sh SEE ALSO
+.Xr getpriority 2 ,
+.Xr setpriority 2 ,
 .Xr csh 1 ,
 .Xr renice 8
 .Sh HISTORY