diff --git a/specification/compute/resource-manager/Microsoft.Compute/stable/2017-12-01/compute.json b/specification/compute/resource-manager/Microsoft.Compute/stable/2017-12-01/compute.json
index 8573cad19315..1208a6b7631c 100644
--- a/specification/compute/resource-manager/Microsoft.Compute/stable/2017-12-01/compute.json
+++ b/specification/compute/resource-manager/Microsoft.Compute/stable/2017-12-01/compute.json
@@ -491,7 +491,7 @@
             "in": "path",
             "required": true,
             "type": "string",
-            "description": "The name of the virtual machine where the extension should be create or updated."
+            "description": "The name of the virtual machine where the extension should be created or updated."
           },
           {
             "name": "vmExtensionName",
@@ -532,6 +532,60 @@
         },
         "x-ms-long-running-operation": true
       },
+      "patch": {
+        "tags": [
+          "VirtualMachineExtensions"
+        ],
+        "operationId": "VirtualMachineExtensions_Update",
+        "description": "The operation to update the extension.",
+        "parameters": [
+          {
+            "name": "resourceGroupName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the resource group."
+          },
+          {
+            "name": "vmName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the virtual machine where the extension should be updated."
+          },
+          {
+            "name": "vmExtensionName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the virtual machine extension."
+          },
+          {
+            "name": "extensionParameters",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/VirtualMachineExtensionUpdate"
+            },
+            "description": "Parameters supplied to the Update Virtual Machine Extension operation."
+          },
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/SubscriptionIdParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/VirtualMachineExtension"
+            }
+          }
+        },
+        "x-ms-long-running-operation": true
+      },
       "delete": {
         "tags": [
           "VirtualMachineExtensions"
@@ -635,6 +689,52 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachines/{vmName}/extensions": {
+      "get": {
+        "tags": [
+          "VirtualMachineExtensions"
+        ],
+        "operationId": "VirtualMachines_GetExtensions",
+        "description": "The operation to get all extensions of a Virtual Machine.",
+        "parameters": [
+          {
+            "name": "resourceGroupName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the resource group."
+          },
+          {
+            "name": "vmName",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The name of the virtual machine containing the extension."
+          },
+          {
+            "name": "$expand",
+            "in": "query",
+            "required": false,
+            "type": "string",
+            "description": "The expand expression to apply on the operation."
+          },
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/SubscriptionIdParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/VirtualMachineExtensionsListResult"
+            }
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/providers/Microsoft.Compute/locations/{location}/publishers/{publisherName}/artifacttypes/vmimage/offers/{offer}/skus/{skus}/versions/{version}": {
       "get": {
         "tags": [
@@ -4434,6 +4534,39 @@
       },
       "description": "Describes the properties of a Virtual Machine Extension."
     },
+    "VirtualMachineExtensionUpdateProperties": {
+      "properties": {
+        "forceUpdateTag": {
+          "type": "string",
+          "description": "How the extension handler should be forced to update even if the extension configuration has not changed."
+        },
+        "publisher": {
+          "type": "string",
+          "description": "The name of the extension handler publisher."
+        },
+        "type": {
+          "type": "string",
+          "description": "Specifies the type of the extension; an example is \"CustomScriptExtension\"."
+        },
+        "typeHandlerVersion": {
+          "type": "string",
+          "description": "Specifies the version of the script handler."
+        },
+        "autoUpgradeMinorVersion": {
+          "type": "boolean",
+          "description": "Indicates whether the extension should use a newer minor version if one is available at deployment time. Once deployed, however, the extension will not upgrade minor versions unless redeployed, even with this property set to true."
+        },
+        "settings": {
+          "type": "object",
+          "description": "Json formatted public settings for the extension."
+        },
+        "protectedSettings": {
+          "type": "object",
+          "description": "The extension can contain either protectedSettings or protectedSettingsFromKeyVault or no protected settings at all."
+        }
+      },
+      "description": "Describes the properties of a Virtual Machine Extension."
+    },
     "VirtualMachineExtension": {
       "properties": {
         "properties": {
@@ -4448,6 +4581,32 @@
       ],
       "description": "Describes a Virtual Machine Extension."
     },
+    "VirtualMachineExtensionUpdate": {
+      "properties": {
+        "properties": {
+          "x-ms-client-flatten": true,
+          "$ref": "#/definitions/VirtualMachineExtensionUpdateProperties"
+        }
+      },
+      "allOf": [
+        {
+          "$ref": "#/definitions/UpdateResource"
+        }
+      ],
+      "description": "Describes a Virtual Machine Extension."
+    },
+    "VirtualMachineExtensionsListResult": {
+      "properties": {
+        "value": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/VirtualMachineExtension"
+          },
+          "description": "The list of extensions"
+        }
+      },
+      "description": "The List Extension operation response"
+    },
     "PurchasePlan": {
       "properties": {
         "publisher": {