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diff --git a/common/layer_switch.h b/common/layer_switch.h
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+++ b/common/layer_switch.h
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+/*
+Copyright 2013 Jun Wako <wakojun@gmail.com>
+
+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, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef LAYER_SWITCH_H
+#define LAYER_SWITCH_H
+
+#include <stdint.h>
+#include "keyboard.h"
+#include "action.h"
+
+
+/* overlays are asigned at layer 16-31 */
+#define OVERLAY_BIT      0x10
+#define OVERLAY_MASK     0x0F
+
+
+/*
+ * Default Layer
+ */
+/* base layer to fall back */
+extern uint8_t default_layer;
+void default_layer_set(uint8_t layer);
+
+
+/*
+ * Keymap Layer
+ */
+extern uint16_t keymap_stat;
+/* return current active layer */
+uint8_t keymap_get_layer(void);
+void keymap_clear(void);
+void keymap_set(uint16_t stat);
+void keymap_move(uint8_t layer);
+void keymap_on(uint8_t layer);
+void keymap_off(uint8_t layer);
+void keymap_invert(uint8_t layer);
+/* bitwise operation */
+void keymap_or(uint16_t stat);
+void keymap_and(uint16_t stat);
+void keymap_xor(uint16_t stat);
+void keymap_debug(void);
+
+
+/*
+ * Overlay Layer
+ */
+extern uint16_t overlay_stat;
+/* return current active layer */
+uint8_t overlay_get_layer(void);
+void overlay_clear(void);
+void overlay_set(uint16_t stat);
+void overlay_move(uint8_t layer);
+void overlay_on(uint8_t layer);
+void overlay_off(uint8_t layer);
+void overlay_invert(uint8_t layer);
+/* bitwise operation */
+void overlay_or(uint16_t stat);
+void overlay_and(uint16_t stat);
+void overlay_xor(uint16_t stat);
+void overlay_debug(void);
+
+
+
+/* return action depending on current layer status */
+action_t layer_switch_get_action(key_t key);
+
+#endif