diff --git a/configs/smdkc100_defconfig b/configs/smdkc100_defconfig
index 6bfe26c..b69f5d4 100644
--- a/configs/smdkc100_defconfig
+++ b/configs/smdkc100_defconfig
@@ -2,6 +2,7 @@
 CONFIG_ARCH_S5PC1XX=y
 CONFIG_TARGET_SMDKC100=y
 CONFIG_IDENT_STRING=" for SMDKC100"
+# CONFIG_MMC is not set
 CONFIG_DEFAULT_DEVICE_TREE="s5pc1xx-smdkc100"
 CONFIG_BOOTDELAY=3
 CONFIG_HUSH_PARSER=y