Merge pull request Azure#4921 from cloudmelon/patch-8

Update how to use new feature

201-vmss-master-slave-customscript/README.md

@@ -8,7 +8,27 @@
 </a>
 
 ## Description
-This template allows you to deploy a VM Scale Set of Linux VMs and create a new virtual network at the same time. These VMs have a custom script extension for customization and are behind a load balancer with NAT rules for rdp connections. This allows to specify the master node number and data node number, adapt to any master / slave architecture
+This template allows you to deploy a VM Scale Set of Linux VMs and create a new virtual network at the same time. These VMs have a custom script extension for customization and are behind a load balancer with NAT rules for SSH connections. This allows to specify the master node number and data node number, adapt to any master / slave architecture
 
+## Using new features 
 
+To enable Accelerated Networking feature ( SR-IOV ) which is a free feature, using the following example : 
 
+In network profile of VMSS , set "enableAcceleratedNetworking" to true, to have more information, please go to https://docs.microsoft.com/en-us/azure/virtual-network/create-vm-accelerated-networking-cli
+
+
+If availability zone is available in your region,  adding the following in your template to improve the availability of your VMSS :
+```
+      "zones": [
+        "1",
+        "2",
+        "3"
+      ]
+}
+
+```
+
+
+Note that your Load Balancer should be STANDARD tier as well as your public IP ( if you're using it ), check here to know more about it : https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-standard-availability-zones
+
+More information at https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-use-availability-zones