diff --git a/specification/compute/resource-manager/Microsoft.Compute/stable/2020-12-01/compute.json b/specification/compute/resource-manager/Microsoft.Compute/stable/2020-12-01/compute.json
index b5feeccd1af2..3d822cf01d86 100644
--- a/specification/compute/resource-manager/Microsoft.Compute/stable/2020-12-01/compute.json
+++ b/specification/compute/resource-manager/Microsoft.Compute/stable/2020-12-01/compute.json
@@ -8940,6 +8940,11 @@
           "$ref": "#/definitions/SubResource",
           "description": "Specifies information about the proximity placement group that the virtual machine should be assigned to. <br><br>Minimum api-version: 2018-04-01."
         },
+        "platformFaultDomain": {
+          "type": "integer",
+          "format": "int32",
+          "description": "Specifies the scale set logical fault domain into which the Virtual Machine will be created. By default, the Virtual Machine will by automatically assigned to a fault domain that best maintains balance across available fault domains.<br><li>This is applicable only if the 'virtualMachineScaleSet' property of this Virtual Machine is set.<li>The Virtual Machine Scale Set that is referenced, must have 'platformFaultDomainCount' &gt; 1.<li>This property cannot be updated once the Virtual Machine is created.<li>Fault domain assignment can be viewed in the Virtual Machine Instance View.<br><br>Minimum api‐version: 2020‐12‐01"
+        },
         "priority": {
           "$ref": "#/definitions/priority",
           "description": "Specifies the priority for the virtual machine. <br><br>Minimum api-version: 2019-03-01"