CORD-3028 fix tosca command error in README

Change-Id: I204273a091ca0245d8c3e189f867a94105a19468
diff --git a/xos/examples/README.md b/xos/examples/README.md
index de64192..5e00ac6 100644
--- a/xos/examples/README.md
+++ b/xos/examples/README.md
@@ -8,7 +8,7 @@
 2. Run the TOSCA recipe
 
     TOSCA_URL=$(minikube service xos-tosca --url)
-    curl -H "xos-username: $ACCOUNT" -H "xos-password: $PASSWORD" -X POST --data-binary @$RECIPE $TOSCA_URL/run    
+    curl -H "xos-username: $USERNAME" -H "xos-password: $PASSWORD" -X POST --data-binary @SimpleExampleServiceInstance.yaml $TOSCA_URL/run
 
 3. Wait a few seconds for the Kubernetes instances to be created.