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diff --git a/keyboards/gkeyboard/gkb_m16/gkb_m16.h b/keyboards/gkeyboard/gkb_m16/gkb_m16.h
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+++ b/keyboards/gkeyboard/gkb_m16/gkb_m16.h
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+/* Copyright 2020 gkeyboard
+ *
+ * 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/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define LAYOUT_ortho_4x4( \
+	K01, K02, K03, K04, \
+	K11, K12, K13, K14, \
+	K21, K22, K23, K24, \
+	K31, K32, K33, K34 \
+) \
+{ \
+  { K01, K02, K03, K04 }, \
+  { K11, K12, K13, K14 }, \
+  { K21, K22, K23, K24 }, \
+  { K31, K32, K33, K34 } \
+}