diff --git a/core/base/inc/TObject.h b/core/base/inc/TObject.h
index f3646aa4f4c5bc5953aa338eeef533b6f265c45c..0637421f9cd0b7fb8ea02624f991d7a94e00c9cf 100644
--- a/core/base/inc/TObject.h
+++ b/core/base/inc/TObject.h
@@ -87,17 +87,23 @@ public:
       kSingleKey     = BIT(0),        ///< write collection with single key
       kOverwrite     = BIT(1),        ///< overwrite existing object with same name
       kWriteDelete   = BIT(2),        ///< write object, then delete previous key with same name
+   };
 
-      ///< Used to request that the class specific implementation of `TObject::Write` 
+protected:
+   enum DeprectatedWriteOpions {
+      ///< Used to request that the class specific implementation of `TObject::Write`
       ///< just prepare the objects to be ready to be written but do not actually write
       ///< them into the TBuffer. This is just for example by TBufferMerger to request
       ///< that the TTree inside the file calls `TTree::FlushBaskets` (outside of the merging lock)
       ///< and TBufferMerger will later ask for the write (inside the merging lock).
       ///< To take advantage of this feature the class needs to overload `TObject::Write`
       ///< and use this enum value accordingly.  (See `TTree::Write` and `TObject::Write`)
-      kOnlyPrepStep  = BIT(3)         
+      ///< Do not use, this feature will be migrate to the Merge function (See TClass and TTree::Merge)
+      kOnlyPrepStep  = BIT(3)
    };
 
+public:
+
    TObject();
    TObject(const TObject &object);
    TObject &operator=(const TObject &rhs);