diff --git a/configs/stv0991_defconfig b/configs/stv0991_defconfig
index c728182..f808ce2 100644
--- a/configs/stv0991_defconfig
+++ b/configs/stv0991_defconfig
@@ -1,6 +1,7 @@
 CONFIG_ARM=y
 CONFIG_TARGET_STV0991=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
+# CONFIG_MMC is not set
 CONFIG_DEFAULT_DEVICE_TREE="stv0991"
 CONFIG_SYS_EXTRA_OPTIONS="STV0991"
 CONFIG_BOOTDELAY=3