diff --git a/configs/a4m2k_defconfig b/configs/a4m2k_defconfig
index e9510ff..da7719c 100644
--- a/configs/a4m2k_defconfig
+++ b/configs/a4m2k_defconfig
@@ -3,6 +3,7 @@
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL_ENV_SUPPORT=y
+# CONFIG_MMC is not set
 CONFIG_MPC5xxx=y
 CONFIG_TARGET_A3M071=y
 CONFIG_FIT=y