diff --git a/plugins/op_waf/t/readme.md b/plugins/op_waf/t/readme.md
index 158ab3bbd..469b23821 100755
--- a/plugins/op_waf/t/readme.md
+++ b/plugins/op_waf/t/readme.md
@@ -1,4 +1,4 @@
-# 火焰图安装
+# 火焰图安装 [ubuntu 20.04]
 ```
 
 sudo apt-get install -y linux-tools-common linux-tools-generic linux-tools-`uname -r`