diff --git a/schemas/2018-06-01/Microsoft.DataFactory.json b/schemas/2018-06-01/Microsoft.DataFactory.json
index be2045ccf1..c85942b567 100644
--- a/schemas/2018-06-01/Microsoft.DataFactory.json
+++ b/schemas/2018-06-01/Microsoft.DataFactory.json
@@ -8665,6 +8665,9 @@
         {
           "$ref": "#/definitions/MappingDataFlow"
         },
+        {
+          "$ref": "#/definitions/Flowlet"
+        },
         {
           "$ref": "#/definitions/WranglingDataFlow"
         }
@@ -8737,6 +8740,22 @@
           "properties": {},
           "description": "Reference data flow parameters from dataset."
         },
+        "parameters": {
+          "oneOf": [
+            {
+              "type": "object",
+              "additionalProperties": {
+                "type": "object",
+                "properties": {}
+              },
+              "properties": {}
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "An object mapping parameter names to argument values."
+        },
         "referenceName": {
           "type": "string",
           "description": "Reference data flow name."
@@ -8780,6 +8799,17 @@
           "type": "string",
           "description": "Transformation description."
         },
+        "flowlet": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/DataFlowReference"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Data flow reference type."
+        },
         "linkedService": {
           "oneOf": [
             {
@@ -8830,6 +8860,17 @@
           "type": "string",
           "description": "Transformation description."
         },
+        "flowlet": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/DataFlowReference"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Data flow reference type."
+        },
         "linkedService": {
           "oneOf": [
             {
@@ -13016,6 +13057,118 @@
       ],
       "description": "Filter activity properties."
     },
+    "Flowlet": {
+      "type": "object",
+      "properties": {
+        "additionalProperties": {
+          "oneOf": [
+            {
+              "type": "object",
+              "additionalProperties": {
+                "type": "object",
+                "properties": {}
+              },
+              "properties": {}
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Unmatched properties from the message are deserialized this collection"
+        },
+        "type": {
+          "type": "string",
+          "enum": [
+            "Flowlet"
+          ]
+        },
+        "typeProperties": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/FlowletTypeProperties"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Flowlet type properties."
+        }
+      },
+      "required": [
+        "type"
+      ],
+      "description": "Data flow flowlet"
+    },
+    "FlowletTypeProperties": {
+      "type": "object",
+      "properties": {
+        "additionalProperties": {
+          "type": "object",
+          "properties": {}
+        },
+        "script": {
+          "type": "string",
+          "description": "Flowlet script."
+        },
+        "scriptLines": {
+          "oneOf": [
+            {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Flowlet script lines."
+        },
+        "sinks": {
+          "oneOf": [
+            {
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/DataFlowSink"
+              }
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "List of sinks in Flowlet."
+        },
+        "sources": {
+          "oneOf": [
+            {
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/DataFlowSource"
+              }
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "List of sources in Flowlet."
+        },
+        "transformations": {
+          "oneOf": [
+            {
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/Transformation"
+              }
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "List of transformations in Flowlet."
+        }
+      },
+      "description": "Flowlet type properties."
+    },
     "ForEachActivity": {
       "type": "object",
       "properties": {
@@ -18394,6 +18547,20 @@
           "type": "string",
           "description": "DataFlow script."
         },
+        "scriptLines": {
+          "oneOf": [
+            {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Data flow script lines."
+        },
         "sinks": {
           "oneOf": [
             {
@@ -21764,6 +21931,17 @@
           "type": "string",
           "description": "Transformation description."
         },
+        "flowlet": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/DataFlowReference"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Data flow reference type."
+        },
         "linkedService": {
           "oneOf": [
             {
@@ -21842,6 +22020,17 @@
           "type": "string",
           "description": "Transformation description."
         },
+        "flowlet": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/DataFlowReference"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Data flow reference type."
+        },
         "linkedService": {
           "oneOf": [
             {
@@ -28191,6 +28380,17 @@
           "type": "string",
           "description": "Transformation description."
         },
+        "flowlet": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/DataFlowReference"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Data flow reference type."
+        },
         "name": {
           "type": "string",
           "description": "Transformation name."