diff --git a/rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/ClassificationService.java b/rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/ClassificationService.java
index b2beb8b45f..678c5b776a 100644
--- a/rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/ClassificationService.java
+++ b/rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/ClassificationService.java
@@ -69,6 +69,7 @@ public interface ClassificationService
 
     /**
      * Gets the default {@link ClassificationLevel}, which will usually be the level with the lowest security clearance.
+     * @return the default classification level, or {@code null} if no security levels are configured.
      */
     ClassificationLevel getDefaultClassificationLevel();