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diff --git a/nuttx/ReleaseNotes b/nuttx/ReleaseNotes
index 69a5d4d70..f9edc709e 100644
--- a/nuttx/ReleaseNotes
+++ b/nuttx/ReleaseNotes
@@ -1128,3 +1128,40 @@ for the STM32F107VC and HCS12 C9S12NE64 MCUs.  Those ports are very
 incomplete as of this writing.
 
 This tarball contains a complete CVS snapshot from December 21, 2009
+
+nuttx-5.1
+^^^^^^^^^
+
+This is the 48th release of NuttX.  This release adds support for two new
+MCU architectures in various states of development:
+
+o AT91SAM3U (http://www.atmel.com/products/at91/sam3landing.asp?family_id=605)
+
+  This release adds support for the SAM3U-EK development board with the
+  AT91SAM3U4E MCU (http://www.atmel.com/dyn/products/product_card_mcu.asp?part_id=4562).
+  As with most NuttX architecutre releases, the release will be rolled out in
+  two parts:  A basic port and an extended port.
+
+  NuttX-5.1 includes the basic port for the SAM3U-EK board.  This release
+  passes the NuttX OS test and is proven to have a valid OS implementation.
+  It supports the basic boot-up, serial console and timer interrupts.  A
+  configuration to support the NuttShell is also included.
+
+  The extended port will also include support for SDIO-based SD cards and
+  USB device (and possible LCD support).  These extensions may or may not
+  happen by the Nuttx 5.2 release as my plate is kind of full now.
+
+o LPC3131 (http://ics.nxp.com/products/lpc3000/lpc313x.lpc314x.lpc315x/)
+
+  This release also adds the complete implementation of the basic port for
+  the NXP LPC3131 MCU on the Embedded Artists EA3131 board
+  (http://www.embeddedartists.com/products/kits/lpc3131_kit.php).  That port,
+  unfortunately has stalled due to tools issues.  Those tool issues have
+  been resolved and I am confident that the verified basic port will be
+  available in NuttX-5.2.
+
+  The extended release will follow and should include SDIO-based SD card
+  support and device USB.
+
+A few additional features and bugfixes of a minor nature were also incorporated
+as detailed in the ChangeLog.