diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Dataset.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Dataset.json
index fa9725904bce..4331209428ba 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Dataset.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Dataset.json
@@ -770,6 +770,18 @@
         "location": {
           "$ref": "#/definitions/DatasetLocation",
           "description": "The location of the ORC data storage."
+        },
+        "orcCompressionCodec": {
+          "type": "string",
+          "enum": [
+            "none",
+            "zlib",
+            "snappy"
+          ],
+          "x-ms-enum": {
+            "name": "orcCompressionCodec",
+            "modelAsString": true
+          }
         }
       },
       "required": [