diff --git a/website/docs/guides/application-development.mdx b/website/docs/guides/application-development.mdx
index d9de25d2e..13b1b7382 100644
--- a/website/docs/guides/application-development.mdx
+++ b/website/docs/guides/application-development.mdx
@@ -83,7 +83,7 @@ func (a *App) shutdown(ctx context.Context) {
 }
 
 func (a *App) Greet(name string) string {
-    return fmt.Printf("Hello %s!", name)
+    return fmt.Sprintf("Hello %s!", name)
 }
 ```