diff --git a/screening/source/java/ch/systemsx/cisd/openbis/dss/generic/server/FeatureTableBuilder.java b/screening/source/java/ch/systemsx/cisd/openbis/dss/generic/server/FeatureTableBuilder.java
index 2400cc8bd383735c82a41d0d5a7835f87aff78c1..469d37836cc7b16649188c9d82bc5242ea8fbf85 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/dss/generic/server/FeatureTableBuilder.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/dss/generic/server/FeatureTableBuilder.java
@@ -114,6 +114,7 @@ public class FeatureTableBuilder
         return new WellFeatureCollection(features, builder.getCodesAndLabels());
     }
 
+    /** stores feature vectors for a set of wells */
     public static class WellFeatureCollection
     {
         private final List<FeatureTableRow> features;
@@ -131,6 +132,7 @@ public class FeatureTableBuilder
             return features;
         }
 
+        /** codes and labels of all features in this collection */
         public List<CodeAndLabel> getFeatureCodesAndLabels()
         {
             return featureNames;
@@ -185,7 +187,7 @@ public class FeatureTableBuilder
     }
 
     /**
-     * Adds feature vectors for specified data set.
+     * Adds feature vectors for specified feature vector data set code.
      */
     DatasetFeaturesBundle addFeatureVectorsOfDataSet(String dataSetCode)
     {