Index: README.md
===================================================================
--- README.md	(revision 7752d1f99e91b74a1fdc11cfd15ae6166803378e)
+++ README.md	(revision f3b78e853856c7838705ecdd61bf67c8b01db6bd)
@@ -56,7 +56,23 @@
 ```
 
+## Log-File
+
 The name of the logfile is ammos.log The logger uses the directory
 stored in the AMMOS_LOG_DIR environment variable. If this variable is
-not set, /tmp is used as default. If the logfile is not writable, the
-standard logger config is used and the logs go directly to console
-(tty). (see ammos_logging.conf file in this repository)
+not set, /tmp is used as default. This might change to *var/log* in
+future versions running under GUIX system. If the logfile is not
+writable, the standard logger config is used and the logs go directly to
+console (tty). (see ammos_logging.conf file in this repository)
+
+## Log-Level
+
+You can change the log-Level by setting the environment variable
+AMMOS_LOG_LEVEL. To turn off logging completely set the level to
+'CRITICAL'
+
+``` shell
+export AMMOS_LOG_LEVEL=CRITICAL
+```
+
+If the environment variable does not exist, the logging level from
+ammos_logging.conf is used.
Index: ammosreader/__init__.py
===================================================================
--- ammosreader/__init__.py	(revision 7752d1f99e91b74a1fdc11cfd15ae6166803378e)
+++ ammosreader/__init__.py	(revision f3b78e853856c7838705ecdd61bf67c8b01db6bd)
@@ -22,2 +22,4 @@
 
 logger = logging.getLogger(__name__)
+
+logger.setLevel = os.environ.get('AMMOS_LOG_LEVEL', logger.getEffectiveLevel())
Index: org/README.org
===================================================================
--- org/README.org	(revision 7752d1f99e91b74a1fdc11cfd15ae6166803378e)
+++ org/README.org	(revision f3b78e853856c7838705ecdd61bf67c8b01db6bd)
@@ -54,8 +54,22 @@
 #+END_SRC
 
+** Log-File
+
 The name of the logfile is ammos.log
 The logger uses the directory stored in the AMMOS_LOG_DIR environment variable.
-If this variable is not set, /tmp is used as default.
+If this variable is not set, /tmp is used as default. This might change to /var/log/
+in future versions running under GUIX system.
 If the logfile is not writable, the standard logger config is used and
 the logs go directly to console (tty).
 (see ammos_logging.conf file in this repository)
+
+** Log-Level
+
+You can change the log-Level by setting the environment variable AMMOS_LOG_LEVEL.
+To turn off logging completely set the level to 'CRITICAL'
+
+#+BEGIN_SRC shell
+export AMMOS_LOG_LEVEL=CRITICAL
+#+END_SRC
+
+If the environment variable does not exist, the logging level from ammos_logging.conf is used.