diff --git a/zh/05.6.md b/zh/05.6.md
index a125d7c0..f3d3ba27 100644
--- a/zh/05.6.md
+++ b/zh/05.6.md
@@ -23,7 +23,7 @@ package main
 import (
 	"fmt"
 	"os"
-    "os/signal"
+	"os/signal"
 	"syscall"
 	"time"