update doc.

site/src/site/sphinx/en/redefine.md

@@ -9,6 +9,10 @@ Reference: [Instrumentation#redefineClasses](https://docs.oracle.com/javase/8/do
 
 > The `reset` command is not valid for classes that have been processed by `redefine`. If you want to reset, you need `redefine` the original bytecode.
 
+
+> The `redefine` command will conflict with the `jad`/`watch`/`trace`/`monitor`/`tt` commands. After executing `redefine`, if you execute the above mentioned command, the bytecode of the class will be reset.
+> The reason is that in the JDK `redefine` and `retransform` are different mechanisms. When two mechanisms are both used to update the bytecode, only the last modified will take effect.
+
 ### Options
 
 |Name|Specification|

site/src/site/sphinx/redefine.md

@@ -9,6 +9,9 @@ redefine
 
 > `reset`命令对`redefine`的类无效。如果想重置，需要`redefine`原始的字节码。
 
+> `redefine`命令和`jad`/`watch`/`trace`/`monitor`/`tt`等命令会冲突。执行完`redefine`之后，如果再执行上面提到的命令，则会把`redefine`的字节码重置。
+> 原因是jdk本身redefine和Retransform是不同的机制，同时使用两种机制来更新字节码，只有最后修改的会生效。
+
 ### 参数说明
 
 |参数名称|参数说明|