diff --git a/src/main/java/de/ids_mannheim/korap/KrillIndex.java b/src/main/java/de/ids_mannheim/korap/KrillIndex.java
index b5930a6..7338472 100644
--- a/src/main/java/de/ids_mannheim/korap/KrillIndex.java
+++ b/src/main/java/de/ids_mannheim/korap/KrillIndex.java
@@ -114,7 +114,7 @@
     private final static Logger log = LoggerFactory.getLogger(KrillIndex.class);
 
     // This advices the java compiler to ignore all loggings
-    public static final boolean DEBUG = false;
+    public static final boolean DEBUG = true;
 
     // TODO: Use configuration instead.
     // Last line of defense against DOS
diff --git a/src/main/resources/log4j.properties b/src/main/resources/log4j.properties
index 5fed33b..b8bf604 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