diff --git a/bds/source/java/ch/systemsx/cisd/bds/IDataStructureHandler.java b/bds/source/java/ch/systemsx/cisd/bds/IDataStructureHandler.java
index 690bcc2e68c33dcb6b76115975367995a22188ab..bc9fece75e6293bcf4c64f41b6710e24acf463f2 100644
--- a/bds/source/java/ch/systemsx/cisd/bds/IDataStructureHandler.java
+++ b/bds/source/java/ch/systemsx/cisd/bds/IDataStructureHandler.java
@@ -27,6 +27,10 @@ public interface IDataStructureHandler
 
     /**
      * Validates this data structure and throws {@link DataStructureException} if invalid.
+     * <p>
+     * This is typically called after {@link #performClosing()} or {@link #performOpening()} has been successfully
+     * invoked.
+     * </p>
      */
     public void assertValid() throws DataStructureException;