diff --git a/src/document/openapi/en/document.yml b/src/document/openapi/en/document.yml
index 3b41f5588..56b998930 100644
--- a/src/document/openapi/en/document.yml
+++ b/src/document/openapi/en/document.yml
@@ -27,7 +27,7 @@ info:
 
     System error message supports Simplified Chinese and English. The system by default will automatically choose the language according to the Accept-Language value in request header. Cookie "locale" value (zh-CN or en-US) will affect the result language.
 
-    ## Which Gateway Api is for me?
+    # Which Gateway Api is for me?
 
     <img src="img/RoyalPay_Gateway_choose_en.jpg">