diff --git a/java/org/slub/rosetta/dps/repository/plugin/XmlFormatValidationPlugin.java b/java/org/slub/rosetta/dps/repository/plugin/XmlFormatValidationPlugin.java
index 2b45564c964ffe6cf9ce45f3325f5bb653479954..ef3e20549efa58599c45803590cc7fc4bde79603 100644
--- a/java/org/slub/rosetta/dps/repository/plugin/XmlFormatValidationPlugin.java
+++ b/java/org/slub/rosetta/dps/repository/plugin/XmlFormatValidationPlugin.java
@@ -476,12 +476,14 @@ public class XmlFormatValidationPlugin implements FormatValidationPlugin {
             if (line.hasOption("cd")) {
                 addFileOptionToMapOrFail(initp, "catalog", line.getOptionValue("cd"));
             } else {
+                // default for junit tests
                 addFileOptionToMapOrFail(initp, "catalog", "/etc/xml/catalog");
             }
             // schema catalog
             if (line.hasOption("cs")) {
                 addFileOptionToMapOrFail(initp, "schemacatalog", line.getOptionValue("cs"));
             } else {
+                // default for unit tests
                 addFileOptionToMapOrFail(initp, "schemacatalog", "example_catalog/schema_catalog.xml");
             }
             // debug log