diff --git a/specification/resources/resource-manager/Microsoft.Resources/preview/2019-10-01-preview/deploymentScripts.json b/specification/resources/resource-manager/Microsoft.Resources/preview/2019-10-01-preview/deploymentScripts.json
index 65e342a4c956..3a0bb4093295 100644
--- a/specification/resources/resource-manager/Microsoft.Resources/preview/2019-10-01-preview/deploymentScripts.json
+++ b/specification/resources/resource-manager/Microsoft.Resources/preview/2019-10-01-preview/deploymentScripts.json
@@ -604,6 +604,11 @@
       "x-ms-external": true,
       "description": "Common properties for the deployment script.",
       "properties": {
+        "containerSettings": {
+          "type": "object",
+          "description": "Container settings.",
+          "$ref": "#/definitions/ContainerConfiguration"
+        },
         "cleanupPreference": {
           "type": "string",
           "description": "The clean up preference when the script execution gets in a terminal state. Default setting is 'Always'.",
@@ -651,6 +656,18 @@
         }
       }
     },
+    "ContainerConfiguration": {
+      "type": "object",
+      "description": "Settings to customize ACI container instance.",
+      "properties": {
+        "containerGroupName": {
+          "type": "string",
+          "description": "Container group name, if not specified then the name will get auto-generated. Not specifying a 'containerGroupName' indicates the system to generate a unique name which might end up flagging an Azure Policy as non-compliant. Use 'containerGroupName' when you have an Azure Policy that expects a specific naming convention or when you want to fully control the name. 'containerGroupName' property must be between 1 and 63 characters long, must contain only lowercase letters, numbers, and dashes and it cannot start or end with a dash and consecutive dashes are not allowed. To specify a 'containerGroupName', add the following object to properties: { \"containerSettings\": { \"containerGroupName\": \"contoso-container\" } }. If you do not want to specify a 'containerGroupName' then do not add 'containerSettings' property.",
+          "minLength": 1,
+          "maxLength": 63
+        }
+      }
+    },
     "ScriptStatus": {
       "type": "object",
       "description": "Generic object modeling results of script execution.",