diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/firewallPolicy.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/firewallPolicy.json
index 7bb0e9d18ffa..443290d6abde 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/firewallPolicy.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/firewallPolicy.json
@@ -1652,6 +1652,14 @@
             "$ref": "#/definitions/FirewallPolicyIntrusionDetectionBypassTrafficSpecifications"
           },
           "x-ms-identifiers": []
+        },
+        "privateIpRanges": {
+          "type": "array",
+          "description": "IDPS Private IP address ranges are used to identify traffic direction (i.e. inbound, outbound, etc.). By default, only ranges defined by IANA RFC 1918 are considered private IP addresses. To modify default ranges, specify your Private IP address ranges with this property",
+          "items": {
+            "type": "string"
+          },
+          "x-ms-identifiers": []
         }
       }
     },
@@ -1957,7 +1965,7 @@
             2
           ],
           "x-ms-enum": {
-            "name": "FirewallpolicyIDPSSignatureDirection",
+            "name": "FirewallPolicyIDPSSignatureDirection",
             "modelAsString": false
           }
         },