diff --git a/lib/libc/sys/kill.2 b/lib/libc/sys/kill.2
index 6234bc15886e..24a43915ea58 100644
--- a/lib/libc/sys/kill.2
+++ b/lib/libc/sys/kill.2
@@ -30,7 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     @(#)kill.2	8.3 (Berkeley) 4/19/94
-.\"	$Id: kill.2,v 1.6 1997/02/22 15:03:55 peter Exp $
+.\"	$Id: kill.2,v 1.7 1997/04/11 18:47:03 bde Exp $
 .\"
 .Dd April 19, 1994
 .Dt KILL 2
@@ -84,7 +84,11 @@ this is a variant of
 .It \&If Fa pid No \&is -1 :
 If the user has super-user privileges,
 the signal is sent to all processes excluding
-system processes and the process sending the signal.
+system processes
+.Pq whose have Dv P_SYSTEM flag set ,
+process with ID 1
+.Pq usually Xr init 8 ,
+and the process sending the signal.
 If the user is not the super user, the signal is sent to all processes
 with the same uid as the user excluding the process sending the signal.
 No error is returned if any process could be signaled.
@@ -124,7 +128,8 @@ of the group could not be signaled.
 .Xr getpgrp 2 ,
 .Xr getpid 2 ,
 .Xr killpg 2 ,
-.Xr sigaction 2
+.Xr sigaction 2 ,
+.Xr init 8
 .Sh STANDARDS
 The
 .Fn kill