diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index eb3aacd4365d7e804d7656bd030f0926c7781bcc..6d58a40064c5cd43d062e6189a2dcf83c2fe1265 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -5107,12 +5107,16 @@ qemu-kvm -net nic,model=? /dev/null
specifies the port number. Ports are numbered starting from 0. There are
usually 0, 1 or 2 serial ports. There is also an optional
type attribute since 1.0.2
- which has two choices for its value, one is isa-serial,
- the other is usb-serial. If type is missing,
- isa-serial will be used by default. For usb-serial
- an optional sub-element <address> with
- type='usb' can tie the device to a particular controller,
- documented above.
+ which has three choices for its value, one is isa-serial,
+ then usb-serial and last one is pci-serial.
+ If type is missing, isa-serial will be used by
+ default. For usb-serial an optional sub-element
+ <address/> with type='usb' can tie the
+ device to a particular controller, documented above.
+ Similarly, pci-serial can be used to attach the device to
+ the pci bus (since 1.2.16). Again, it has
+ optional sub-element <address/> with
+ type='pci' to select desired location on the PCI bus.