diff --git a/doc/reference/classes/Geant4Classes.h b/doc/reference/classes/Geant4Classes.h
index fe1da4393aac3129c06ce1fb2d8ce42739d16753..e8c5b73c29cff8914c4f340cddcebcdca7194d15 100644
--- a/doc/reference/classes/Geant4Classes.h
+++ b/doc/reference/classes/Geant4Classes.h
@@ -15,6 +15,10 @@ class G4UImessenger		{};
 /** Class of the Geant4 toolkit. \see http://www-geant4.kek.jp/Reference  */
 class G4UserEventAction		{};
 
+/// Class of the Geant4 toolkit. See http://www-geant4.kek.jp/Reference
+/** Class of the Geant4 toolkit. \see http://www-geant4.kek.jp/Reference  */
+class G4UserLimits		{};
+
 /// Class of the Geant4 toolkit. See http://www-geant4.kek.jp/Reference
 /** Class of the Geant4 toolkit. \see http://www-geant4.kek.jp/Reference  */
 class G4UserRunAction		{};
diff --git a/examples/DDDB/include/DDDB/DDDBConversion.h b/examples/DDDB/include/DDDB/DDDBConversion.h
index 84af3a7a10268755c19e4d7f42d6e0a35454b712..f50b21e7afd9591ca9a20ef944529a6500b57efc 100644
--- a/examples/DDDB/include/DDDB/DDDBConversion.h
+++ b/examples/DDDB/include/DDDB/DDDBConversion.h
@@ -609,8 +609,8 @@ namespace dd4hep {
       DDDBCatalog *top, *structure, *geometry;
     };
 
-    /// Declaration of a not implemented tag-class to handle conditions
-    class dddb_conditions;
+    /// Declaration of a tag-class to handle conditions
+    class dddb_conditions  {};
 
     template <typename T> class Increment {
     public: