diff --git a/lib/libc/sys/intro.2 b/lib/libc/sys/intro.2
index 90f63a072ac3..414cde45c141 100644
--- a/lib/libc/sys/intro.2
+++ b/lib/libc/sys/intro.2
@@ -1,4 +1,4 @@
-.\"	$NetBSD: intro.2,v 1.46 2006/12/22 11:56:45 pooka Exp $
+.\"	$NetBSD: intro.2,v 1.47 2007/11/04 21:35:48 pooka Exp $
 .\"
 .\" Copyright (c) 1980, 1983, 1986, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -163,7 +163,7 @@ use an argument of a call.
 The reliable detection of this error cannot be guaranteed and when not detected
 may result in the generation of a signal, indicating an address violation,
 which is sent to the process.
-.It Er 15 ENOTBLK Em "Not a block device" .
+.It Er 15 ENOTBLK Em "Block device required" .
 A block device operation was attempted on a non-block device or file.
 .It Er 16 EBUSY Em "Resource busy" .
 An attempt to use a system resource which was in use at the time