diff --git a/configs/mx31ads_defconfig b/configs/mx31ads_defconfig
index b4c2ad3..2a098ee 100644
--- a/configs/mx31ads_defconfig
+++ b/configs/mx31ads_defconfig
@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_TARGET_MX31ADS=y
+# CONFIG_MMC is not set
 CONFIG_BOOTDELAY=3
 CONFIG_CMD_SPI=y
 # CONFIG_CMD_SETEXPR is not set