diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/2017-09-01-preview/entityTypes/Pipeline.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/2017-09-01-preview/entityTypes/Pipeline.json
index 195df6d11ec1..5ee9b587665d 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/2017-09-01-preview/entityTypes/Pipeline.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/2017-09-01-preview/entityTypes/Pipeline.json
@@ -300,7 +300,7 @@
       }
     },
     "DynamicsSource": {
-      "description": "A copy activity Dynamics entity source.",
+      "description": "A copy activity Dynamics source.",
       "type": "object",
       "allOf": [
         {
@@ -943,6 +943,35 @@
         }
       }
     },
+    "DynamicsSink": {
+      "description": "A copy activity Dynamics sink.",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "#/definitions/CopySink"
+        }
+      ],
+      "properties": {
+        "writeBehavior": {
+          "description": "The write behavior for the operation.",
+          "type": "string",
+          "enum": [
+            "Upsert"
+          ],
+          "x-ms-enum": {
+            "name": "DynamicsSinkWriteBehavior",
+            "modelAsString": true
+          }
+        },
+        "ignoreNullValues": {
+          "type": "object",
+          "description": "The flag indicating whether ignore null values from input dataset (except key fields) during write operation. Default is false. Type: boolean (or Expression with resultType boolean)."
+        }
+      },
+      "required": [
+        "writeBehavior"
+      ]
+    },
     "CopyTranslator": {
       "discriminator": "type",
       "description": "A copy activity translator.",