diff --git a/eng/mgmt/mgmtmetadata/datafactory_resource-manager.txt b/eng/mgmt/mgmtmetadata/datafactory_resource-manager.txt
index e885e62e9249..caf5b506a3d2 100644
--- a/eng/mgmt/mgmtmetadata/datafactory_resource-manager.txt
+++ b/eng/mgmt/mgmtmetadata/datafactory_resource-manager.txt
@@ -4,11 +4,11 @@ Commencing code generation
 Generating CSharp code
 Executing AutoRest command
 cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/datafactory/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --tag=package-2018-06 --csharp-sdks-folder=D:\Projects\azure-sdk-for-net\sdk
-2020-10-16 09:04:28 UTC
+2020-10-28 02:50:39 UTC
 Azure-rest-api-specs repository information
 GitHub fork: Azure
 Branch:      master
-Commit:      ce71a0bd91903fe312dc5ddb9b3e520755d6dd77
+Commit:      e86a6eed316503ed17c2f7dfab94b2fa0f0c4129
 AutoRest information
 Requested version: v2
 Bootstrapper version:    autorest@2.0.4413
diff --git a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/CHANGELOG.md b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/CHANGELOG.md
index ec1d87c1af0f..e640883fba74 100644
--- a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/CHANGELOG.md
+++ b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/CHANGELOG.md
@@ -6,6 +6,7 @@
 - Added logSettings property into CopyActivity
 - Added connectionProperties property into Concur linkedService
 - Added authenticationType and sessionToken properties into AmazonS3 linkedService
+- Added support for more frequency types for TumblingWindowTrigger
 
 ## Version 4.12.0
 ###  Feature Additions
diff --git a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Generated/Models/TumblingWindowFrequency.cs b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Generated/Models/TumblingWindowFrequency.cs
index cb9b05f7a2cc..c604611f87e0 100644
--- a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Generated/Models/TumblingWindowFrequency.cs
+++ b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Generated/Models/TumblingWindowFrequency.cs
@@ -18,5 +18,6 @@ public static class TumblingWindowFrequency
     {
         public const string Minute = "Minute";
         public const string Hour = "Hour";
+        public const string Month = "Month";
     }
 }
diff --git a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Generated/Models/TumblingWindowTrigger.cs b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Generated/Models/TumblingWindowTrigger.cs
index 5a56eb8d06cd..ff3c7f15b191 100644
--- a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Generated/Models/TumblingWindowTrigger.cs
+++ b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Generated/Models/TumblingWindowTrigger.cs
@@ -40,7 +40,7 @@ public TumblingWindowTrigger()
         /// <param name="pipeline">Pipeline for which runs are created when an
         /// event is fired for trigger window that is ready.</param>
         /// <param name="frequency">The frequency of the time windows. Possible
-        /// values include: 'Minute', 'Hour'</param>
+        /// values include: 'Minute', 'Hour', 'Month'</param>
         /// <param name="interval">The interval of the time windows. The
         /// minimum interval allowed is 15 Minutes.</param>
         /// <param name="startTime">The start time for the time period for the
@@ -98,7 +98,7 @@ public TumblingWindowTrigger()
 
         /// <summary>
         /// Gets or sets the frequency of the time windows. Possible values
-        /// include: 'Minute', 'Hour'
+        /// include: 'Minute', 'Hour', 'Month'
         /// </summary>
         [JsonProperty(PropertyName = "typeProperties.frequency")]
         public string Frequency { get; set; }
diff --git a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Microsoft.Azure.Management.DataFactory.csproj b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Microsoft.Azure.Management.DataFactory.csproj
index a330e93da586..d61aa980da1b 100644
--- a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Microsoft.Azure.Management.DataFactory.csproj
+++ b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/src/Microsoft.Azure.Management.DataFactory.csproj
@@ -14,6 +14,7 @@
 - Added logSettings property into CopyActivity
 - Added connectionProperties property into Concur linkedService
 - Added authenticationType and sessionToken properties into AmazonS3 linkedService
+- Added support for more frequency types for TumblingWindowTrigger
   ]]></PackageReleaseNotes>
   </PropertyGroup>
   <PropertyGroup>
diff --git a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/tests/JsonSamples/TriggerJsonSamples.cs b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/tests/JsonSamples/TriggerJsonSamples.cs
index 371f47775829..153af7ad04cb 100644
--- a/sdk/datafactory/Microsoft.Azure.Management.DataFactory/tests/JsonSamples/TriggerJsonSamples.cs
+++ b/sdk/datafactory/Microsoft.Azure.Management.DataFactory/tests/JsonSamples/TriggerJsonSamples.cs
@@ -178,6 +178,43 @@ public class TriggerJsonSamples : JsonSampleCollection<TriggerJsonSamples>
     }
   }
 }
+";
+
+        public const string TumblingWindowTriggerSample_Month = @"
+{
+  name: ""myDemoTWTrigger"",
+  properties: {
+    type: ""TumblingWindowTrigger"",
+    typeProperties: {
+      frequency: ""Month"",
+      interval: 24,
+      startTime: ""2017-04-14T13:00:00Z"",
+      endTime: ""2018-04-14T13:00:00Z"",
+      delay: ""00:00:01"",
+      retryPolicy: {
+        count: 3,
+        intervalInSeconds: 30
+      },
+      maxConcurrency: 10
+    },
+    pipeline: {
+      pipelineReference: {
+        type: ""PipelineReference"",
+        referenceName: ""myPipeline""
+      },
+      parameters: {
+        windowStart: {
+          type: ""Expression"",
+          value: ""@{trigger().outputs.windowStartTime}""
+        },
+        windowEnd: {
+          type: ""Expression"",
+          value: ""@{trigger().outputs.windowEndTime}""
+        },
+      }
+    }
+  }
+}
 ";
 
         [JsonSample]