diff --git a/jenkins/README.md b/jenkins/README.md
index 8e2ca81..b301fe6 100644
--- a/jenkins/README.md
+++ b/jenkins/README.md
@@ -27,6 +27,11 @@ $ docker-compose exec --user root jenkins apk add -U git
 $ curl http://localhost:8080/
 ```
 
+## download jdk and agent.jar
+
+- https://www.oracle.com/java/technologies/downloads/#jdk23-linux
+- http://localhost:8080/jnlpJars/agent.jar
+
 ## fix slow network
 
 ```bash