diff --git a/src/main/resources/log4j.properties b/src/main/resources/log4j.properties
index b8bf604..5fed33b 100644
--- a/src/main/resources/log4j.properties
+++ b/src/main/resources/log4j.properties
@@ -1,4 +1,4 @@
-# log4j.rootLogger = ERROR, stdout
+log4j.rootLogger = ERROR, stdout
 
 # Queries:
 # log4j.logger.de.ids_mannheim.korap.query.SpanNextQuery = TRACE, stdout
@@ -28,9 +28,9 @@
 # log4j.logger.de.ids_mannheim.korap.response.Match = TRACE, stdout
 
 # Index:
-log4j.logger.de.ids_mannheim.korap.KrillIndex = TRACE, stdout
-log4j.logger.de.ids_mannheim.korap.index.PositionsToOffset = TRACE, stdout
-log4j.logger.de.ids_mannheim.korap.index.MultiTermTokenStream = TRACE, stdout
+# log4j.logger.de.ids_mannheim.korap.KrillIndex = TRACE, stdout
+# log4j.logger.de.ids_mannheim.korap.index.PositionsToOffset = TRACE, stdout
+# log4j.logger.de.ids_mannheim.korap.index.MultiTermTokenStream = TRACE, stdout
 
 # Tests:
 # log4j.logger.de.ids_mannheim.korap.index.TestSegmentIndex = TRACE, stdout