diff --git a/src/main/java/de/ids_mannheim/korap/query/spans/RepetitionSpans.java b/src/main/java/de/ids_mannheim/korap/query/spans/RepetitionSpans.java
index 6764c9d..dad2fe5 100644
--- a/src/main/java/de/ids_mannheim/korap/query/spans/RepetitionSpans.java
+++ b/src/main/java/de/ids_mannheim/korap/query/spans/RepetitionSpans.java
@@ -14,6 +14,9 @@
 
 import de.ids_mannheim.korap.query.SpanRepetitionQuery;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * Enumeration of spans occurring multiple times in a sequence. The
  * number of
@@ -23,11 +26,16 @@
  * */
 public class RepetitionSpans extends SimpleSpans {
 
+    // Logger
+    private final Logger log = LoggerFactory.getLogger(RepetitionSpans.class);
+
+    // This advices the java compiler to ignore all loggings
+    public static final boolean DEBUG = false;
+
     private int min, max;
     private long matchCost;
     private List<CandidateSpan> matchList;
 
-
     /**
      * Constructs RepetitionSpans from the given
      * {@link SpanRepetitionQuery}.
@@ -106,6 +114,15 @@
         while ((hasMoreSpans = firstSpans.next())
                 && startSpan.getDoc() == firstSpans.doc()) {
 
+            if (DEBUG) {
+                log.debug("Check adjacency at {}-{}|{}-{} in {}",
+                          prevSpan.getStart(),
+                          prevSpan.getEnd(),
+                          firstSpans.start(),
+                          firstSpans.end(),
+                          startSpan.getDoc());
+            };
+
             if (firstSpans.start() > prevSpan.getEnd()) {
                 break;
             }
diff --git a/src/main/resources/log4j.properties b/src/main/resources/log4j.properties
index 5fed33b..78bf62e 100644
--- a/src/main/resources/log4j.properties
+++ b/src/main/resources/log4j.properties
@@ -9,6 +9,7 @@
 # log4j.logger.de.ids_mannheim.korap.query.spans.ElementAttributeSpans = TRACE, stdout
 # log4j.logger.de.ids_mannheim.korap.query.spans.KorapTermSpan = TRACE, stdout
 # log4j.logger.de.ids_mannheim.korap.query.spans.WithinSpans = TRACE, stdout
+# log4j.logger.de.ids_mannheim.korap.query.spans.RepetitionSpans = TRACE, stdout
 # log4j.logger.de.ids_mannheim.korap.query.spans.NextSpans = TRACE, stdout
 # log4j.logger.de.ids_mannheim.korap.query.spans.SimpleSpans = TRACE, stdout
 # log4j.logger.de.ids_mannheim.korap.query.spans.ClassSpans = TRACE, stdout