diff --git a/Dockerfile b/Dockerfile
index 1ce09b5..c908930 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,18 +1,32 @@
+# CentOS7, as EoL is on 2024 ...
 FROM centos:7
+# SAPJVM and SAPCC version
+# check https://tools.hana.ondemand.com/#cloud
 ARG SAPCC_VERSION=2.13.1
 ARG SAPJVM_VERSION=8.1.075
+# working setup dir
 WORKDIR /tmp/sapcc
-#RUN yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
-RUN yum -y install which unzip wget net-tools less sudo; yum clean all
+# full update
+RUN yum -y update && yum -y clean all
+# add EPEL repo
+RUN yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
+# install some usefull tools
+RUN yum -y install which unzip wget net-tools less sudo
+# download the SAP JVM and SAPCC
 RUN wget --no-check-certificate --no-cookies --header "Cookie: eula_3_1_agreed=tools.hana.ondemand.com/developer-license-3_1.txt; path=/;" -S https://tools.hana.ondemand.com/additional/sapcc-$SAPCC_VERSION-linux-x64.zip && \
     wget --no-check-certificate --no-cookies --header "Cookie: eula_3_1_agreed=tools.hana.ondemand.com/developer-license-3_1.txt; path=/;" -S https://tools.hana.ondemand.com/additional/sapjvm-$SAPJVM_VERSION-linux-x64.rpm && \
     unzip sapcc-$SAPCC_VERSION-linux-x64.zip && \
     rpm -i sapjvm-$SAPJVM_VERSION-linux-x64.rpm && \
     rpm -i com.sap.scc-ui-$SAPCC_VERSION-8.x86_64.rpm
+# clean up previously installed rpm packages
 RUN rm /tmp/sapcc/*.rpm
+# set JAVA_HOME variable with the new SAP JVM
 ENV JAVA_HOME=/opt/sapjvm_8/
-#RUN chsh -s /bin/bash sccadmin
+# SAPCC Web Interface
 EXPOSE 8443
+# SAPCC user
 USER sccadmin
+# SAPCC working dir
 WORKDIR /opt/sap/scc
+# run SAPCC command
 CMD ./go.sh