diff --git a/lib/libc/sys/intro.2 b/lib/libc/sys/intro.2
index 45772803b9e6..419c59fbb322 100644
--- a/lib/libc/sys/intro.2
+++ b/lib/libc/sys/intro.2
@@ -1,4 +1,4 @@
-.\"	$NetBSD: intro.2,v 1.23 2001/03/13 03:24:13 fair Exp $
+.\"	$NetBSD: intro.2,v 1.24 2001/03/16 06:56:48 fair Exp $
 .\"
 .\" Copyright (c) 1980, 1983, 1986, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -73,6 +73,15 @@ Note that a number of system calls overload the meanings of these
 error numbers, and that the meanings must be interpreted according
 to the type and circumstances of the call.
 .Pp
+The manual page for each system call will list some of the common
+errno codes that system call can return, but that should not be
+considered an exhaustive list, i.e.
+a properly written program should be able to gracefully recover from
+any error that a system call might return.
+Documenting all the error codes that a system call can return in
+a more specification-like manner would take more resources than
+this project has available.
+.Pp
 The following is a complete list of the errors and their
 names as given in
 .Aq Pa errno.h .