diff --git a/doc/authorized_payment.md b/doc/authorized_payment.md
index e245fa63..82d73a66 100644
--- a/doc/authorized_payment.md
+++ b/doc/authorized_payment.md
@@ -55,7 +55,7 @@ winzou_state_machine:
             before:
                 app_ensure_capture_payment:
                     on: ["ship"]
-                    do: ["@App\StateMachine\CaptureOrderProcessor", "process"]
+                    do: ['@App\StateMachine\CaptureOrderProcessor', "process"]
                     args: ["object"]
 ```