diff --git a/configs/B4420QDS_SPIFLASH_defconfig b/configs/B4420QDS_SPIFLASH_defconfig
index fcf683d..69e47a2 100644
--- a/configs/B4420QDS_SPIFLASH_defconfig
+++ b/configs/B4420QDS_SPIFLASH_defconfig
@@ -1,4 +1,5 @@
 CONFIG_PPC=y
+# CONFIG_MMC is not set
 CONFIG_MPC85xx=y
 CONFIG_TARGET_B4420QDS=y
 CONFIG_FIT=y