diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/preview/2017-09-01-preview/entityTypes/Trigger.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/preview/2017-09-01-preview/entityTypes/Trigger.json
index e0ab1a2bd29d..316ed7490f0f 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/preview/2017-09-01-preview/entityTypes/Trigger.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/preview/2017-09-01-preview/entityTypes/Trigger.json
@@ -293,7 +293,7 @@
           "x-ms-client-flatten": true,
           "properties": {
             "frequency": {
-              "$ref": "#/definitions/TumblingWindowFrequency", 
+              "$ref": "#/definitions/TumblingWindowFrequency",
               "description": "The frequency of the time windows."
             },
             "interval": {
@@ -324,6 +324,13 @@
             "retryPolicy": {
               "$ref": "#/definitions/RetryPolicy",
               "description": "Retry policy that will be applied for failed pipeline runs."
+            },
+            "dependsOn": {
+              "type": "array",
+              "description": "Triggers that this trigger depends on. Only tumbling window triggers are supported.",
+              "items": {
+                "$ref": "#/definitions/DependencyReference"
+              }
             }
           },
           "required": [
@@ -365,6 +372,112 @@
           "maximum": 86400
         }
       }
+    },
+    "TriggerReference": {
+      "description": "Trigger reference type.",
+      "type": "object",
+      "properties": {
+        "type": {
+          "description": "Trigger reference type.",
+          "type": "string",
+          "enum": [
+            "TriggerReference"
+          ]
+        },
+        "referenceName": {
+          "description": "Reference trigger name.",
+          "type": "string"
+        }
+      },
+      "required": [
+        "type",
+        "referenceName"
+      ]
+    },
+    "DependencyReference": {
+      "description": "Referenced dependency.",
+      "type": "object",
+      "discriminator": "type",
+      "properties": {
+        "type": {
+          "description": "The type of dependency reference.",
+          "type": "string"
+        }
+      },
+      "required": [
+        "type"
+      ]
+    },
+    "TriggerDependencyReference": {
+      "description": "Trigger referenced dependency.",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "#/definitions/DependencyReference"
+        }
+      ],
+      "properties": {
+        "referenceTrigger": {
+          "description": "Referenced trigger.",
+          "$ref": "#/definitions/TriggerReference"
+        }
+      },
+      "required": [
+        "referenceTrigger"
+      ]
+    },
+    "TumblingWindowTriggerDependencyReference": {
+      "description": "Referenced tumbling window trigger dependency.",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "#/definitions/TriggerDependencyReference"
+        }
+      ],
+      "properties": {
+        "offset": {
+          "description": "Timespan applied to the start time of a tumbling window when evaluating dependency, .Net timespan format.",
+          "type": "string",
+          "pattern": "((\\d+)\\.)?(\\d\\d):(60|([0-5][0-9])):(60|([0-5][0-9]))",
+          "minLength": 8,
+          "maxLength": 15
+        },
+        "size": {
+          "description": "The size of the window when evaluating the dependency. If undefined the frequency of the tumbling window will be used, .Net timespan format.",
+          "type": "string",
+          "pattern": "((\\d+)\\.)?(\\d\\d):(60|([0-5][0-9])):(60|([0-5][0-9]))",
+          "minLength": 8,
+          "maxLength": 15
+        }
+      }
+    },
+    "SelfDependencyTumblingWindowTriggerReference": {
+      "description": "Self referenced tumbling window trigger dependency.",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "#/definitions/DependencyReference"
+        }
+      ],
+      "properties": {
+        "offset": {
+          "description": "Timespan applied to the start time of a tumbling window when evaluating dependency, .Net timespan format.",
+          "type": "string",
+          "pattern": "((\\d+)\\.)?(\\d\\d):(60|([0-5][0-9])):(60|([0-5][0-9]))",
+          "minLength": 8,
+          "maxLength": 15
+        },
+        "size": {
+          "description": "The size of the window when evaluating the dependency. If undefined the frequency of the tumbling window will be used, .Net timespan format.",
+          "type": "string",
+          "pattern": "((\\d+)\\.)?(\\d\\d):(60|([0-5][0-9])):(60|([0-5][0-9]))",
+          "minLength": 8,
+          "maxLength": 15
+        }
+      },
+      "required": [
+        "offset"
+      ]
     }
   }
 }