diff --git a/src/config.sh b/src/config.sh
index 71b4f1f4..0c41e691 100644
--- a/src/config.sh
+++ b/src/config.sh
@@ -1,15 +1,21 @@
 TOOLNAME="OCRmyPDF"
 VERSION="v2.x"
 
-EXIT_BAD_ARGS="1"			# possible exit codes
+# possible exit codes
+EXIT_BAD_ARGS="1"
 EXIT_BAD_INPUT_FILE="2"
 EXIT_MISSING_DEPENDENCY="3"
 EXIT_INVALID_OUPUT_PDFA="4"
 EXIT_OTHER_ERROR="5"
-LOG_ERR="0"				# 0=only error messages
-LOG_INFO="1"				# 1=error messages and some infos
-LOG_DEBUG="2"				# 2=debug level logging
+
+# possible log levels
+LOG_ERR="0"				# only error messages
+LOG_WARN="1"				# error messages and warnings
+LOG_INFO="2"				# error messages, warnings and some infos
+LOG_DEBUG="3"				# debug level logging
 SRC="./src"				# location of the source folder (except source of external tools like jhove)
+
+# various paths
 OCR_PAGE="$SRC/ocrPage.sh"		# path to the script aimed at OCRing one page
 JHOVE="./jhove/bin/JhoveApp.jar"	# java SW for validating the final PDF/A
 JHOVE_CFG="./jhove/conf/jhove.conf"	# location of the jhove config file