Merge pull request #273875 from tysonfms/patch-56

Update container-instances-virtual-network-concepts.md

Author: prmerger-automator[bot]

articles/container-instances/container-instances-virtual-network-concepts.md

@@ -62,7 +62,7 @@ A virtual network defines the address space in which you create one or more subn
 
 Subnets segment the virtual network into separate address spaces usable by the Azure resources you place in them. You create one or several subnets within a virtual network.
 
-The subnet that you use for container groups can contain only container groups. When you first deploy a container group to a subnet, Azure delegates that subnet to Azure Container Instances. Once delegated, the subnet can be used only for container groups. If you attempt to deploy resources other than container groups to a delegated subnet, the operation fails.
+The subnet that you use for container groups can contain only container groups. Before you deploy a container group to a subnet, you must explicitly delegate the subnet before provisioning. Once delegated, the subnet can be used only for container groups. If you attempt to deploy resources other than container groups to a delegated subnet, the operation fails.
 
 ### Network profile