diff --git a/hosts/jenkins/etc/default/jenkins b/hosts/jenkins/etc/default/jenkins
index ca765b9fd9ae7bc0c28ef8910ffbdca02b58d466..db206ca2b300875b529922e459f3c352966f3d58 100644
--- a/hosts/jenkins/etc/default/jenkins
+++ b/hosts/jenkins/etc/default/jenkins
@@ -10,11 +10,17 @@ JAVA=/usr/bin/java
 JENKINS_HOME=/var/lib/$NAME
 
 # arguments to pass to java
-#JAVA_ARGS="-Djava.awt.headless=true"  # Allow graphs etc. to work even when an X server is present
+#
+# Allow graphs etc. to work even when an X server is present
+JAVA_ARGS="-Djava.awt.headless=true"
+
 #JAVA_ARGS="-Xmx256m"
 #JAVA_ARGS="-Djava.net.preferIPv4Stack=true" # make jenkins listen on IPv4 address
 JAVA_ARGS="-Djava.awt.headless=true -Xms4G -Xmx8G -server -XX:+AlwaysPreTouch -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=$JENKINS_HOME/heapDumps/ -Xloggc:$JENKINS_HOME/javaGC/gc-%t.log -XX:NumberOfGCLogFiles=5 -XX:+UseGCLogFileRotation -XX:GCLogFileSize=20m -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintHeapAtGC -XX:+PrintGCCause -XX:+PrintTenuringDistribution -XX:+PrintReferenceGC -XX:+PrintAdaptiveSizePolicy -XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent -XX:+ParallelRefProcEnabled -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:+UnlockDiagnosticVMOptions -XX:G1SummarizeRSetStatsPeriod=1"
 
+# make jenkins listen on IPv4 address
+#JAVA_ARGS="-Djava.net.preferIPv4Stack=true"
+
 PIDFILE=/var/run/$NAME/$NAME.pid
 
 # user and group to be invoked as (default to jenkins)
@@ -24,7 +30,7 @@ JENKINS_GROUP=$NAME
 # location of the jenkins war file
 JENKINS_WAR=/usr/share/$NAME/$NAME.war
 
-# set this to false if you don't want Hudson to run by itself
+# set this to false if you don't want Jenkins to run by itself
 # in this set up, you are expected to provide a servlet container
 # to host jenkins.
 RUN_STANDALONE=true
@@ -52,18 +58,18 @@ MAXOPENFILES=65535
 #   If commented out, the value from the OS is inherited,  which is normally 022 (as of Ubuntu 12.04,
 #   by default umask comes from pam_umask(8) and /etc/login.defs
 
-# UMASK=027
 UMASK=022
 
 # port for HTTP connector (default 8080; disable with -1)
 HTTP_PORT=8080
 
 
-# servlet context, important if you want to use apache proxying  
+# servlet context, important if you want to use apache proxying
 PREFIX=/$NAME
 
 # arguments to pass to jenkins.
 # --javahome=$JAVA_HOME
+# --httpListenAddress=$HTTP_HOST (default 0.0.0.0)
 # --httpPort=$HTTP_PORT (default 8080; disable with -1)
 # --httpsPort=$HTTP_PORT
 # --argumentsRealm.passwd.$ADMIN_USER=[password]