diff --git a/tutorials/katacoda/case-async-jobs-cn/run-cmd-in-backgd.md b/tutorials/katacoda/case-async-jobs-cn/run-cmd-in-backgd.md
index 57652a6b4..5703a54fd 100644
--- a/tutorials/katacoda/case-async-jobs-cn/run-cmd-in-backgd.md
+++ b/tutorials/katacoda/case-async-jobs-cn/run-cmd-in-backgd.md
@@ -1,5 +1,5 @@
 
-比如希望执行后台执行trace命令，那么调用下面命令
+比如希望在后台执行trace命令，那么调用下面命令
 
 `trace demo.MathGame primeFactors &`{{execute T2}}