diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
index 5e26933b60db..1bbe83bbe342 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
@@ -6726,6 +6726,44 @@
         "waitTimeInSeconds"
       ]
     },
+    "FailActivity": {
+      "x-ms-discriminator-value": "Fail",
+      "type": "object",
+      "description": "This activity will fail within its own scope and output a custom error message and error code. The error message and code can provided either as a string literal or as an expression that can be evaluated to a string at runtime. The activity scope can be the whole pipeline or a control activity (e.g. foreach, switch, until), if the fail activity is contained in it.",
+      "allOf": [
+        {
+          "$ref": "#/definitions/ControlActivity"
+        }
+      ],
+      "properties": {
+        "typeProperties": {
+          "description": "Fail activity properties.",
+          "x-ms-client-flatten": true,
+          "$ref": "#/definitions/FailActivityTypeProperties"
+        }
+      },
+      "required": [
+        "typeProperties"
+      ]
+    },
+    "FailActivityTypeProperties": {
+      "description": "Fail activity properties.",
+      "type": "object",
+      "properties": {
+        "message": {
+          "description": "The error message that surfaced in the Fail activity. It can be dynamic content that's evaluated to a non empty/blank string at runtime. Type: string (or Expression with resultType string).",
+          "type": "object"
+        },
+        "errorCode": {
+          "description": "The error code that categorizes the error type of the Fail activity. It can be dynamic content that's evaluated to a non empty/blank string at runtime. Type: string (or Expression with resultType string).",
+          "type": "object"
+        }
+      },
+      "required": [
+        "message",
+        "errorCode"
+      ]
+    },
     "UntilActivity": {
       "x-ms-discriminator-value": "Until",
       "description": "This activity executes inner activities until the specified boolean expression results to true or timeout is reached, whichever is earlier.",