diff --git a/azurerm/resource_arm_virtual_network_gateway.go b/azurerm/resource_arm_virtual_network_gateway.go
index 262375ddf9ba..c949d0a6c547 100644
--- a/azurerm/resource_arm_virtual_network_gateway.go
+++ b/azurerm/resource_arm_virtual_network_gateway.go
@@ -87,6 +87,9 @@ func resourceArmVirtualNetworkGateway() *schema.Resource {
 					string(network.VirtualNetworkGatewaySkuNameVpnGw1),
 					string(network.VirtualNetworkGatewaySkuNameVpnGw2),
 					string(network.VirtualNetworkGatewaySkuNameVpnGw3),
+					string(network.VirtualNetworkGatewaySkuNameErGw1AZ),
+					string(network.VirtualNetworkGatewaySkuNameErGw2AZ),
+					string(network.VirtualNetworkGatewaySkuNameErGw3AZ),
 				}, true),
 			},
 
@@ -758,6 +761,9 @@ func validateArmVirtualNetworkGatewayExpressRouteSku() schema.SchemaValidateFunc
 		string(network.VirtualNetworkGatewaySkuTierStandard),
 		string(network.VirtualNetworkGatewaySkuTierHighPerformance),
 		string(network.VirtualNetworkGatewaySkuTierUltraPerformance),
+		string(network.VirtualNetworkGatewaySkuNameErGw1AZ),
+		string(network.VirtualNetworkGatewaySkuNameErGw2AZ),
+		string(network.VirtualNetworkGatewaySkuNameErGw3AZ),
 	}, true)
 }
 
diff --git a/website/docs/r/virtual_network_gateway.html.markdown b/website/docs/r/virtual_network_gateway.html.markdown
index 953dbd48e10b..f14ae518282e 100644
--- a/website/docs/r/virtual_network_gateway.html.markdown
+++ b/website/docs/r/virtual_network_gateway.html.markdown
@@ -135,7 +135,8 @@ The following arguments are supported:
 
 * `sku` - (Required) Configuration of the size and capacity of the virtual network
     gateway. Valid options are `Basic`, `Standard`, `HighPerformance`, `UltraPerformance`,
-    `VpnGw1`, `VpnGw2` and `VpnGw3` and depend on the `type` and `vpn_type` arguments.
+    `ErGw1AZ`, `ErGw2AZ`, `ErGw3AZ`, `VpnGw1`, `VpnGw2` and `VpnGw3`
+    and depend on the `type` and `vpn_type` arguments.
     A `PolicyBased` gateway only supports the `Basic` sku. Further, the `UltraPerformance`
     sku is only supported by an `ExpressRoute` gateway.