diff --git a/src/main/java/de/ids_mannheim/korap/query/DistanceConstraint.java b/src/main/java/de/ids_mannheim/korap/query/DistanceConstraint.java
index b061046..29e191a 100644
--- a/src/main/java/de/ids_mannheim/korap/query/DistanceConstraint.java
+++ b/src/main/java/de/ids_mannheim/korap/query/DistanceConstraint.java
@@ -1,5 +1,10 @@
 package de.ids_mannheim.korap.query;
 
+/**	Create a distance constraint for multiple distance query.
+ * 	 
+ * 	@author margaretha
+ * */
+
 public class DistanceConstraint {
 	private int minDistance, maxDistance;
 	private String unit;
diff --git a/src/main/java/de/ids_mannheim/korap/query/SpanDistanceQuery.java b/src/main/java/de/ids_mannheim/korap/query/SpanDistanceQuery.java
index 3368ef9..c145200 100644
--- a/src/main/java/de/ids_mannheim/korap/query/SpanDistanceQuery.java
+++ b/src/main/java/de/ids_mannheim/korap/query/SpanDistanceQuery.java
@@ -20,9 +20,9 @@
 
 /** Match two ordered or unordered Spans with minimum and maximum 
  * 	distance constraints. The distance unit can be word (token), 
- * 	sentence or paragraph. The distance constraint can also be
- * 	specified to match some Spans which do not co-occur with some 
- * 	other Spans within a min and max distance. 
+ * 	sentence or paragraph. The distance can also be specified to match 
+ * 	some Spans which do NOT co-occur with some other Spans within a min 
+ * 	and max distance. 
  * 
  * 	@author margaretha
  * */