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diff --git a/keyboards/cool836a/cool836a.h b/keyboards/cool836a/cool836a.h
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+++ b/keyboards/cool836a/cool836a.h
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+/* Copyright 2021 Ohashi
+ *
+ * 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( \
+  K000, K001, K002, K003, K004, K005,   K300, K301, K302, K303, K304, K305, \
+  K100, K101, K102, K103, K104, K105,   K400, K401, K402, K403, K404, K405, \
+  K200, K201, K202, K203, K204, K205,   K500, K501, K502, K503, K504, K505 \
+) \
+{ \
+  { K000, K001, K002, K003, K004, K005 }, \
+  { K100, K101, K102, K103, K104, K105 }, \
+  { K200, K201, K202, K203, K204, K205 }, \
+  { K300, K301, K302, K303, K304, K305 }, \
+  { K400, K401, K402, K403, K404, K405 }, \
+  { K500, K501, K502, K503, K504, K505 }, \
+}