diff --git a/README.md b/README.md
index e207711..73f825b 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Based on the jvm instrumentation tech, javassist lib, JVMTI.
 # Usage
 Download the zip file from the [release](https://github.com/sunwu51/JVMByteSwapTool/releases) page.
 
-Make sure you have a JDK >= 1.8.
+Make sure you have a JDK >= 1.8 and should better JDK <= 11, because javassist may not support new language feature util now.
 ```bash
 $ unzip swapper-<latest-version>.zip
 
@@ -37,4 +37,4 @@ Trigger this method, and then the params and return value and execution time cos
 
 It's `Watch` one of the functions provided by swapper tool.
 
-Get more functions and details from the [wiki](https://github.com/sunwu51/JVMByteSwapTool/wiki).
\ No newline at end of file
+Get more functions and details from the [wiki](https://github.com/sunwu51/JVMByteSwapTool/wiki).