diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index eb00c01d967133088f500a4a11b5f67c24c7f484..949e2fc1b482a08aef5bdfcbc98c3080464636d2 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -4132,6 +4132,24 @@
+
+ While the information outlined above applies to most virtio devices,
+ there are a few exceptions:
+
+
+
+ -
+ for SCSI controllers,
virtio-scsi must be used instead
+ of virtio for backwards compatibility reasons;
+
+ -
+ some devices, such as GPUs and input devices (keyboard, tablet and
+ mouse), are only defined in the virtio 1.0 spec and as such don't
+ have a transitional variant: the only accepted model is
+
virtio, which will result in a non-transitional device.
+
+
+
For more details see the
qemu patch posting and the