diff --git a/doc/ServerDocument.md b/doc/ServerDocument.md
index 282cc07..bba0f3d 100644
--- a/doc/ServerDocument.md
+++ b/doc/ServerDocument.md
@@ -74,6 +74,14 @@
 		return computedToken;
 	}
 ```
+
+
+```ruby
+require 'redcarpet'
+markdown = Redcarpet.new("Hello World!")
+puts markdown.to_html
+```
+
 注意：参数是按字母升序排列