diff --git a/STM32F1/variants/maple_ret6/board/board.h b/STM32F1/variants/maple_ret6/board/board.h
index 86d94f0..4f6fae7 100644
--- a/STM32F1/variants/maple_ret6/board/board.h
+++ b/STM32F1/variants/maple_ret6/board/board.h
@@ -102,6 +102,16 @@
 #define BOARD_USB_DISC_DEV      GPIOC
 #define BOARD_USB_DISC_BIT      12
 
+/*
+ * SDIO Pins
+ */
+#define BOARD_SDIO_D0 			PC8
+#define BOARD_SDIO_D1 			PC9
+#define BOARD_SDIO_D2 			PC10
+#define BOARD_SDIO_D3 			PC11
+#define BOARD_SDIO_CLK 			PC12
+#define BOARD_SDIO_CMD 			PD2
+
 /* Pin aliases: these give the GPIO port/bit for each pin as an
  * enum. These are optional, but recommended. They make it easier to
  * write code using low-level GPIO functionality. */
@@ -117,4 +127,4 @@ enum {
 
 //15 16 17 18 19 20 21 22 23 24 25 26 27 28
 
-//29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
\ No newline at end of file
+//29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45