diff --git a/board/freescale/mx6qsabresd/mx6qsabresd.c b/board/freescale/mx6qsabresd/mx6qsabresd.c
index 2b3926aaf3aa53a33367e9040ab2a9aaf5cb199a..5ebbff3f8c1460854e4017fb93d0019e7f310fef 100644
--- a/board/freescale/mx6qsabresd/mx6qsabresd.c
+++ b/board/freescale/mx6qsabresd/mx6qsabresd.c
@@ -160,6 +160,13 @@ int board_mmc_init(bd_t *bis)
 {
 	int i;
 
+	/*
+	 * According to the board_mmc_init() the following map is done:
+	 * (U-boot device node)    (Physical Port)
+	 * mmc0                    SD2
+	 * mmc1                    SD3
+	 * mmc2                    eMMC
+	 */
 	for (i = 0; i < CONFIG_SYS_FSL_USDHC_NUM; i++) {
 		switch (i) {
 		case 0: