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diff --git a/nuttx/drivers/README.txt b/nuttx/drivers/README.txt
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+README
+^^^^^^
+
+This directory contains various device drivers -- both block and
+character drivers as well as other more specialized drivers.
+
+Files in this directory:
+^^^^^^^^^^^^^^^^^^^^^^^
+
+can.c
+	An unfinished CAN driver.
+
+dev_null.c and dev_zero.c
+	These files provide the standard /dev/null and /dev/zero devices.
+ 	See include/nuttx/fs.h for functions that should be called if you
+	want to register these devices (devnull_register() and
+	devzero_register()).
+
+loop.c
+	Supports the standard loop device that can be used to export a
+	file (or character device) as a block device.  See losetup() and
+	loteardown() in	include/nuttx/fs.h.
+
+ramdisk.c
+	Can be used to set up a block of memory or (read-only) FLASH as
+	a block driver that can be mounted as a files system.  See
+	include/nuttx/ramdisk.h.
+
+Subdirectories of this directory:
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+bch/
+	Contains logic that may be used to convert a block driver into
+	a character driver.  This is the complementary conversion as that
+	performed by loop.c.  See include/nuttx/fs.h for registration
+	information.
+
+mmcsd/
+	Support for MMC/SD block drivers.  At present, only SPI-based
+	MMC/SD is supported. See include/nuttx/mmcsd.h.
+
+net/
+	Network interface drivers.  See also include/nuttx/net.h
+
+pipes/
+	FIFO and named pipe drivers.  Standard interfaces are declared
+	in include/unistd.h
+
+serial/
+	Front-ends character drivers for chip-specific UARTs.  This provide
+	some TTY-like functionality and are commonly used (but not required for)
+	the NuttX system console.  See include/nuttx/serial.h
+
+usbdev/
+	USB device drivers.  See include/nuttx/usb*.h
+