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diff --git a/pcbnew/zones_functions_for_undo_redo.h b/pcbnew/zones_functions_for_undo_redo.h
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+/**
+ * @file zones_functions_for_undo_redo.h
+ */
+
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2009 Jean-Pierre Charras <jean-pierre.charras@gipsa-lab.inpg.fr>
+ * Copyright (C) 2007 KiCad Developers, see change_log.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+
+/* These functions are relative to undo redo function, when zones are involved.
+ * When a zone outline is modified (or created) this zone, or others zones on the same layer
+ * and with the same netcode can change or can be deleted
+ * This is due to the fact overlapping zones are merged
+ * Also, when a zone outline is modified by adding a cutout area,
+ * this zone can be converted to more than one area, if the outline is break to 2 or more outlines
+ * and therefore new zones are created
+ *
+ * Due to the complexity of potential changes, and the fact there are only few zones
+ * in a board, and a zone has only few segments outlines, the more easy way to
+ * undo redo changes is to make a copy of all zones that can be changed
+ * and see after zone edition or creation what zones that are really modified,
+ * and ones they are modified (changes, deletion or addition)
+*/
+
+#ifndef ZONES_FUNCTIONS_TO_UNDO_REDO_H
+#define ZONES_FUNCTIONS_TO_UNDO_REDO_H
+
+
+/**
+ * Function SaveCopyOfZones
+ * creates a copy of zones having a given netcode on a given layer,
+ * and fill a pick list with pickers to handle these copies
+ * @param aPickList = the pick list
+ * @param aPcb = the Board
+ * @param aNetCode = the reference netcode. if aNetCode < 0 all netcodes are used
+ * @param aLayer = the layer of zones. if aLayer < 0, all layers are used
+ * @return the count of saved copies
+ */
+int SaveCopyOfZones(PICKED_ITEMS_LIST & aPickList, BOARD* aPcb, int aNetCode, LAYER_NUM aLayer );
+
+
+/**
+ * Function UpdateCopyOfZonesList
+ * check a pick list to remove zones identical to their copies
+ * and set the type of operation in picker (UR_DELETED, UR_CHANGED)
+ * @param aPickList = the main pick list
+ * @param aAuxiliaryList = the list of deleted or added (new created) items after calculations
+ * @param aPcb = the Board
+ */
+void UpdateCopyOfZonesList( PICKED_ITEMS_LIST& aPickList, PICKED_ITEMS_LIST& aAuxiliaryList, BOARD* aPcb );
+
+#endif      // ZONES_FUNCTIONS_TO_UNDO_REDO_H