diff --git a/share/man/man9/wdc.9 b/share/man/man9/wdc.9
index fdfd88548404..711a9d3d9b49 100644
--- a/share/man/man9/wdc.9
+++ b/share/man/man9/wdc.9
@@ -1,4 +1,4 @@
-.\"	$NetBSD: wdc.9,v 1.9 2002/02/13 08:18:57 ross Exp $
+.\"	$NetBSD: wdc.9,v 1.10 2002/08/14 12:30:22 bjh21 Exp $
 .\"
 .\" Copyright (c) 1998 Manuel Bouyer.
 .\"
@@ -81,6 +81,11 @@ struct wdc_softc { /* Per controller state */
 #define WDC_CAPABILITY_ATA_NOSTREAM 0x0040
 #define WDC_CAPABILITY_ATAPI_NOSTREAM 0x0080
 #define WDC_CAPABILITY_NO_EXTRA_RESETS 0x0100
+#define WDC_CAPABILITY_PREATA 0x0200
+#define WDC_CAPABILITY_IRQACK 0x0400
+#define WDC_CAPABILITY_SINGLE_DRIVE 0x0800
+#define WDC_CAPABILITY_NOIRQ  0x1000
+#define WDC_CAPABILITY_SELECT  0x2000
         u_int8_t      pio_mode;
         u_int8_t      dma_mode;
         int nchannels;
@@ -276,6 +281,10 @@ avoid the controller reset at the end of the disks probe.
 This reset is needed for some controllers, but causes problems with some
 others.
 .Pp
+.Va WDC_CAPABILITY_NOIRQ
+tells the driver that this controller doesn't have its interrupt lines
+wired up usefully, so it should always use polled transfers.
+.Pp
 The bus front-end needs to fill in the following
 elements of
 .Va channel_softc :