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diff --git a/keyboards/handwired/symmetric70_proto/promicro/normal/config.h b/keyboards/handwired/symmetric70_proto/promicro/normal/config.h
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+++ b/keyboards/handwired/symmetric70_proto/promicro/normal/config.h
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+/*
+Copyright 2021 mtei
+
+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
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+#define MATRIX_ROW_PINS { D4, C6, D7, E6, B4 }
+#define MATRIX_COL_PINS { F4,F4,F5,F5, F6,F6,F7,F7,  B6,B6,B2,B2, B3,B3,B1,B1 }
+
+#define MATRIX_MUL_SEL  {  0, 1, 0, 1,  0, 1, 0, 1,   1, 0, 1, 0,  1, 0, 1, 0 }
+/* use 74HC157: quadruple 2-line to 1-line data selectors / multiplexers */
+#define MATRIX_MUL_SELECT  B5 /* 74HC157 pin1:~A/B */
+
+#ifdef MATRIX_IO_DELAY_ADAPTIVE_FAST
+#    define MATRIX_IO_DELAY_PORTS  B0, B0, F0, F0
+#    define MATRIX_IO_DELAY_MULSEL  0,  1,  0,  1
+//                                  76543210    76543210    76543210    76543210
+#    define MATRIX_IO_DELAY_MASKS 0b01001110, 0b01001110, 0b11110000, 0b11110000
+#endif