diff --git a/doc/source/guides/neutron.rst b/doc/source/guides/neutron.rst
index 1e20d7f..be85b63 100644
--- a/doc/source/guides/neutron.rst
+++ b/doc/source/guides/neutron.rst
@@ -535,3 +535,19 @@
     LB_PHYSICAL_INTERFACE=eth0
     PUBLIC_PHYSICAL_NETWORK=default
     LB_INTERFACE_MAPPINGS=default:eth0
+
+Creating specific OVS bridges for physical networks
+---------------------------------------------------
+
+When using the Open vSwitch ML2 mechanism driver, it is possible to
+have multiple Open vSwitch bridges meant for physical networking be
+automatically created by setting the ``OVS_BRIDGE_MAPPINGS`` to a list of
+physical network to bridge name associations with the following syntax:
+
+::
+    OVS_BRIDGE_MAPPINGS=net1name:bridge1name,net2name:bridge2name,<...>
+
+Also, ``OVS_BRIDGE_MAPPINGS`` has precedence over ``PHYSICAL_NETWORK`` and
+``OVS_PHYSICAL_BRIDGE``, meaning that if the former is set, the latter
+ones will be ignored. When ``OVS_BRIDGE_MAPPINGS`` is not set, the other
+variables will still be evaluated.