diff --git a/PLUGIN-INF/metadata_SLUBMatroskaFFV1FormatValidationPlugin.xml b/PLUGIN-INF/metadata_SLUBMatroskaFFV1FormatValidationPlugin.xml
index 78c218e5aea61429686cf060dd9b0727fb1afa2e..744a3ab7cbe2f7451cf0e228f346ab6908ef00c5 100644
--- a/PLUGIN-INF/metadata_SLUBMatroskaFFV1FormatValidationPlugin.xml
+++ b/PLUGIN-INF/metadata_SLUBMatroskaFFV1FormatValidationPlugin.xml
@@ -7,6 +7,7 @@
     <fr:x_form xmlns:fr="http://com/exlibris/digitool/common/forms/xmlbeans">
       <form_name>SLUBMatroskaFFV1FormatValidationPlugin_Params</form_name>
       <description>SLUBMatroskaFFV1FormatValidationPlugin_parameters_form</description>
+      <!-- HINT: 2 versions, see https://github.com/ExLibrisGroup/Rosetta.dps-sdk-projects/blob/master/7.3/dps-sdk-projects/dps-sdk-deposit/src/xsd/x_form.xsd#L19 -->
       <version>0.1</version>
       <grid_x>1</grid_x>
       <md_format>1</md_format>