diff --git a/conf/optimize_archive_tables.conf.sample b/conf/optimize_archive_tables.conf.sample
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+# ==========
+# Settings for script trigger_piwik_archives.sh
+# ==========
+
+# - MYSQL_CREDENTIAL_ARGS
+# -
+# - MySQL / MariaDB credentials
+# -
+# - Giving password on command line is insecure an sind mysql 5.5
+# - you will get a warning doing so.
+# - 
+# - Reading username/password fro file ist also possible, using MySQL/MariaDB
+# - commandline parameter '--defaults-file'.
+# - 
+# - Since Mysql Version 5.6, you can read username/password from
+# - encrypted file.
+# -
+# -    Create (encrypted) option file:
+# -    $ mysql_config_editor set --login-path=piwik_admin --socket=/tmp/mysql.sock  --user=piwik_admin --password
+# -    $ Password:
+# -
+# -    Use of option file:
+# -    $ mysql --login-path=local ...
+# -
+# - Example
+# -    mysql_credential_args="--login-path=piwik_admin"
+# -    mysql_credential_args="--defaults-file=/etc/mysql/debian.cnf" (Debian default)
+# -    mysql_credential_args="--defaults-file=/usr/local/mysql/sys-maint.cnf"
+# -
+# - Defaults to:
+# -    MYSQL_CREDENTIAL_ARGS="--defaults-file=/usr/local/mysql/sys-maint.cnf"
+# -
+#MYSQL_CREDENTIAL_ARGS="--defaults-file=/usr/local/mysql/sys-maint.cnf"
+
+
+# - STATS_HOSTNAME
+# -
+# - Hostname which provides matomo statistics
+# -
+# - Example:
+# -    STATS_HOSTNAME="stats.warenform.de"
+# -
+# - Defaults to stats.<domain-of-this-hostname>
+# -
+#STATS_HOSTNAME=""
+
+
+# - STATS_BASE_DIR
+# -
+# - Base directory where all matomo (piwik) instances are located.
+# -
+# - Example:
+# -    STATS_BASE_DIR="/var/www/stats.warenform.de"
+# -
+#  Defaults to:
+# -    STATS_BASE_DIR="/var/www/${STATS_HOSTNAME}""
+# -
+#STATS_BASE_DIR=""
+
+
+# - MATOMO_PREFIX
+# -
+# - Databases and Matomo instances named as ${MATOMO_PREFIX}_<Number>.
+# -
+# - Example:
+# -    MATOMO_PREFIX="piwik"
+# -
+# - Defaults to:
+# -    MATOMO_PREFIX="matomo"
+# -
+#MATOMO_PREFIX="matomo"