Set vxlan_group with LinuxBridge Agents

PROD-34864

Change-Id: Id4fdee90b608093b2af9aa43b83cf1a9e52b0c1e
diff --git a/README.rst b/README.rst
index ef03f8b..5a58663 100644
--- a/README.rst
+++ b/README.rst
@@ -1775,6 +1775,21 @@
           protocol: http
 
 
+Set vxlan_group with LinuxBridge Agents
+-------------------------------
+
+.. code-block:: yaml
+
+    neutron:
+      gateway:
+        vxlan:
+          group: 224.0.0.1
+      ....
+      compute:
+        vxlan:
+          group: 224.0.0.1
+
+
 Upgrades
 ========