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Author: anaharris-ms

articles/reliability/reliability-app-service.md

@@ -25,7 +25,7 @@ To explore how Azure App Service can bolster the resiliency of your application
 
 ## Availability zone support
 
-Azure availability zones are at least three physically separate groups of datacenters within each Azure region. Datacenters within each zone are equipped with independent power, cooling, and networking infrastructure. In the case of a local zone failure, availability zones are designed so that if the one zone is affected, regional services, capacity, and high availability are supported by the remaining two zones.  Failures can range from software and hardware failures to events such as earthquakes, floods, and fires. Tolerance to failures is achieved with redundancy and logical isolation of Azure services. For more detailed information on availability zones in Azure, see [Regions and availability zones](/azure/availability-zones/az-overview).
+Azure availability zones are at least three physically separate groups of datacenters within each Azure region. Datacenters within each zone are equipped with independent power, cooling, and networking infrastructure. Availability zones are designed to ensure high availability in the case of a local zone failure. If one zone is affected by the failure, the remaining two zones support all regional services, capacity, and high availability.  Failures can range from software and hardware failures to events such as earthquakes, floods, and fires. Tolerance to failures is achieved with redundancy and logical isolation of Azure services. For more detailed information on availability zones in Azure, see [Regions and availability zones](/azure/availability-zones/az-overview).
 
 Azure App Service Environment can be deployed across [availability zones (AZ)](../reliability/availability-zones-overview.md) to help you achieve resiliency and reliability for your business-critical workloads. This architecture is also known as zone redundancy.