[RFC PATCH 4/5] docs/man: document VIF vid keyword

[Leigh Brown <leigh@xxxxxxxxxxxxx>]

Document the new `vid' keyword in xl-network-configuration(5).

Signed-off-by: Leigh Brown <leigh@xxxxxxxxxxxxx>
---
 docs/man/xl-network-configuration.5.pod.in | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/man/xl-network-configuration.5.pod.in 
b/docs/man/xl-network-configuration.5.pod.in
index f3e379bcf8..fe2615ae30 100644
--- a/docs/man/xl-network-configuration.5.pod.in
+++ b/docs/man/xl-network-configuration.5.pod.in
@@ -259,6 +259,12 @@ Specifies the MTU (i.e. the maximum size of an IP payload, 
exclusing headers). T
 default value is 1500 but, if the VIF is attached to a bridge, it will be set 
to match
 unless overridden by this parameter.
 
+=head2 vid
+
+Specifies the VLAN ID. If this is set to a non-zero value, it will be specified
+when attaching the VIF to a bridge.  This can be used on operating systems that
+support bridge VLANs (e.g. Linux using iproute2).
+
 =head2 trusted / untrusted
 
 An advisory setting for the frontend driver on whether the backend should be
-- 
2.39.2