diff --git a/dockerfiles/alpine-jenkins.txt b/dockerfiles/alpine-jenkins.txt
index d6abf75..7e98ff3 100644
--- a/dockerfiles/alpine-jenkins.txt
+++ b/dockerfiles/alpine-jenkins.txt
@@ -1,12 +1,17 @@
 FROM alpine:latest
 LABEL description="Jenkins"
 LABEL maintainer="racken@one27.cf"
+LABEL notes="Get initial admin password by docker exec -it <container-id> and cat /root/.jenkins/secrets/initialAdminPassword"
+LABEL java-version="openjdk11"
+LABEL jenkins-version="2.222.3"
+LABEL exposed-port="8080"
+LABEL jenkins-path="/jenkins"
 ENV container docker
 RUN apk add openjdk11 wget openjdk11-jre-headless ttf-dejavu; mkdir /opt/tomcat
 WORKDIR /opt/tomcat
 RUN wget -q -O- http://ftp.cuhk.edu.hk/pub/packages/apache.org/tomcat/tomcat-9/v9.0.34/bin/apache-tomcat-9.0.34.tar.gz | tar zxf - --strip-components=1
 RUN rm -rf /opt/tomcat/webapps/ROOT
-RUN wget -q -O /opt/tomcat/webapps/ROOT.war http://mirrors.jenkins.io/war-stable/latest/jenkins.war
+RUN wget -q -O /opt/tomcat/webapps/jenkins.war http://mirrors.jenkins.io/war-stable/latest/jenkins.war
 ENV JAVA_HOME="/usr"
 ENV JAVA_OPTS="-Djava.awt.headless=true"
 EXPOSE 8080