diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/server/logic/HCSImageDatasetLoader.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/server/logic/HCSImageDatasetLoader.java
index cce3af27fe874d8ec388951ae0337e4adba63f58..28a7bae1160fc8ea2499c1e5821a4acbc13ad3ce 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/server/logic/HCSImageDatasetLoader.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/server/logic/HCSImageDatasetLoader.java
@@ -197,6 +197,7 @@ class HCSImageDatasetLoader extends PlateDatasetLoader
         return references;
     }
 
+    /** Sets parents of all datasets in 'childrenDataSets'. */
     protected void gatherChildrenDataSets(final Map<Long, ExternalData> childrenDataSets,
             List<ExternalData> parentDataSets, String childTypePattern)
     {