diff --git a/charts/azure/azure-instance-stop/engine.yaml b/charts/azure/azure-instance-stop/engine.yaml
index 7a3b269..b2d0596 100644
--- a/charts/azure/azure-instance-stop/engine.yaml
+++ b/charts/azure/azure-instance-stop/engine.yaml
@@ -19,11 +19,15 @@ spec:
             - name: CHAOS_INTERVAL
               value: '30'            
 
-            # provide the target instance name
+            # provide the target instance name(s) (comma separated if multiple)
             - name: AZURE_INSTANCE_NAME
               value: ''
 
             # provide the resource group of the instance
             - name: RESOURCE_GROUP
               value: ''
+            
+            # accepts enable/disable, default is disable
+            - name: SCALE_SET
+              value: ''
 
diff --git a/charts/azure/azure-instance-stop/experiment.yaml b/charts/azure/azure-instance-stop/experiment.yaml
index 93bca9e..361ef55 100644
--- a/charts/azure/azure-instance-stop/experiment.yaml
+++ b/charts/azure/azure-instance-stop/experiment.yaml
@@ -54,13 +54,17 @@ spec:
     - name: RAMP_TIME
       value: ''
 
-    # provide the target instance name
+    # provide the target instance name(s) (comma separated if multiple)
     - name: AZURE_INSTANCE_NAME
       value: ''
 
     # provide the resource group of the instance
     - name: RESOURCE_GROUP
       value: ''
+    
+    # accepts enable/disable, default is disable
+    - name: SCALE_SET
+      value: ''
 
     # Provide the path of aks credentials mounted from secret  
     - name: AZURE_AUTH_LOCATION