diff --git a/DDCore/src/plugins/Compact2Objects.cpp b/DDCore/src/plugins/Compact2Objects.cpp
index 68bf1de08a1e8290236a121489fef03e4051f96f..6e20b44428d29fb80e8da97fb5a0f992bba033b3 100644
--- a/DDCore/src/plugins/Compact2Objects.cpp
+++ b/DDCore/src/plugins/Compact2Objects.cpp
@@ -10,6 +10,12 @@
 // Author     : M.Frank
 //
 //==========================================================================
+//
+// Main conversion operations for the compact notation.
+// - Create elements, materials, etc.
+// - Calls detector construction factories.
+//
+//==========================================================================
 
 // Framework includes
 #include "DD4hep/DetFactoryHelper.h"