diff --git a/doc/install-guide/section_neutron-network-node.xml b/doc/install-guide/section_neutron-network-node.xml
index ca22be2a43..762e16040c 100644
--- a/doc/install-guide/section_neutron-network-node.xml
+++ b/doc/install-guide/section_neutron-network-node.xml
@@ -190,7 +190,7 @@ firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewal
local_ip = INSTANCE_TUNNELS_INTERFACE_IP_ADDRESS
tunnel_type = gre
enable_tunneling = True
-bridge_mapping = external:br-ex
+bridge_mappings = external:br-ex
Replace
INSTANCE_TUNNELS_INTERFACE_IP_ADDRESS
with the IP address of the instance tunnels network interface