diff --git a/DDCore/include/Parsers/detail/Dimension.h b/DDCore/include/Parsers/detail/Dimension.h
index cdae00f1b06ee15d5df1cab73608441798c613b9..adef386af8eab7622bc78f3acccafea1b487e889 100644
--- a/DDCore/include/Parsers/detail/Dimension.h
+++ b/DDCore/include/Parsers/detail/Dimension.h
@@ -746,11 +746,11 @@ namespace dd4hep {
       std::string refStr() const;
       /// Access "module" attribute as STL string
       std::string moduleStr() const;
-      /// Access "module" attribute as STL string
+      /// Access "module" attribute as STL string. Return default value if not present
       std::string moduleStr(const std::string& default_value) const;
       /// Access "readout" attribute as STL string
       std::string readoutStr() const;
-      /// Access "readout" attribute as STL string
+      /// Access "readout" attribute as STL string. Return default value if not present
       std::string readoutStr(const std::string& default_value) const;
       /// Access vis attribute as STL string. If not present empty return empty string
       std::string visStr() const;