--- wikisrc/ports/xen/howto.mdwn	2016/12/20 15:05:36	1.117
+++ wikisrc/ports/xen/howto.mdwn	2016/12/20 15:07:56	1.118
@@ -38,6 +38,9 @@ features for IOMMU virtualization, Intel
 TODO: Explain whether Xen on NetBSD makes use of these features.
 TODO: Review by someone who really understands this.
 
+Note a FreeBSD dom0 requires VT-x and VT-d (or equivalent); this is
+because the FreeBSD dom0 does not run in PV mode.
+
 At boot, the dom0 kernel is loaded as a module with Xen as the kernel.
 The dom0 can start one or more domUs.  (Booting is explained in detail
 in the dom0 section.)