diff --git a/install/getting-started-knative-app.md b/install/getting-started-knative-app.md
index 96942f3b9..6c7e2e398 100644
--- a/install/getting-started-knative-app.md
+++ b/install/getting-started-knative-app.md
@@ -128,7 +128,7 @@ asssigned an external IP address.
    step.
    
     ```shell
-    curl -H "Host: helloworld-go.default.example.com" http://IP_ADDRESS
+    curl -H "Host: helloworld-go.default.example.com" http://${IP_ADDRESS}
     Hello World: Go Sample v1!
     ```