diff --git a/SQL_Parser_Parameterize.md b/SQL_Parser_Parameterize.md
index 4451e00..c1e7098 100644
--- a/SQL_Parser_Parameterize.md
+++ b/SQL_Parser_Parameterize.md
@@ -9,7 +9,17 @@ select * from t where id = 2
 select * from t where id = ?
 ```
 
-# 2. 参数化
+# 2. SQL参数化
+## 2.1 SQL参数化API
+```java
+package com.alibaba.druid.sql.visitor;
+
+public class ParameterizedOutputVisitorUtils {
+    public static String parameterize(String sql, String dbType);
+}
+```
+
+## 2.2 SQL参数化DEMO
 ```java
 import com.alibaba.druid.sql.visitor.ParameterizedOutputVisitorUtils;