diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
index ef5a40af2ae6..26b716af39ad 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
@@ -4078,7 +4078,7 @@
           "type": "object",
           "description": "The Spark version of new cluster. Type: string (or Expression with resultType string)."
         },
-        "newClusterNumOfWorker": { 
+        "newClusterNumOfWorker": {
           "type": "object",
           "description": "Number of worker nodes that new cluster should have. A string formatted Int32, like '1' means numOfWorker is 1 or '1:10' means auto-scale from 1 as min and 10 as max. Type: string (or Expression with resultType string)."
         },
@@ -4087,7 +4087,15 @@
           "description": "The node types of new cluster. Type: string (or Expression with resultType string)."
         },
         "newClusterSparkConf": {
-          "description": "a set of optional, user-specified Spark configuration key-value pairs.",
+          "description": "A set of optional, user-specified Spark configuration key-value pairs.",
+          "type": "object",
+          "additionalProperties": {
+            "type": "object",
+            "description": "Type: string (or Expression with resultType string)."
+          }
+        },
+        "newClusterSparkEnvVars": {
+          "description": "A set of optional, user-specified Spark environment variables key-value pairs.",
           "type": "object",
           "additionalProperties": {
             "type": "object",