diff --git a/README b/README
index 70dd97d..766e9e0 100644
--- a/README
+++ b/README
@@ -1629,6 +1629,16 @@
 		downloads. This buffer should be as large as possible for a
 		platform. Define this to the size available RAM for fastboot.
 
+		CONFIG_FASTBOOT_FLASH
+		The fastboot protocol includes a "flash" command for writing
+		the downloaded image to a non-volatile storage device. Define
+		this to enable the "fastboot flash" command.
+
+		CONFIG_FASTBOOT_FLASH_MMC_DEV
+		The fastboot "flash" command requires additional information
+		regarding the non-volatile storage device. Define this to
+		the eMMC device that fastboot should use to store the image.
+
 - Journaling Flash filesystem support:
 		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
 		CONFIG_JFFS2_NAND_DEV