diff --git a/What-is-rule-file-and-how-to-write.md b/What-is-rule-file-and-how-to-write.md
index 8f8e237..e5648cf 100644
--- a/What-is-rule-file-and-how-to-write.md
+++ b/What-is-rule-file-and-how-to-write.md
@@ -1,4 +1,4 @@
-Anyproxy exposes a lot of interface for you to hack requests. To use them, you have to write a *.js file which is a Node.js module. Here we name this kind of file as **rule file** , which means this file defines the rule to handle all requests.
+Anyproxy exposes a lot of interface for you to hack requests. To use them, you have to write a \*.js file which is a Node.js module. Here we name this kind of file as **rule file** , which means this file defines the rule to handle all requests.
 
 How proxy works
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