diff --git a/HISTORY.rst b/HISTORY.rst
index 8cf78a3a..e0d0a741 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -4,6 +4,13 @@ Release History
 PlatformIO 2.0
 --------------
 
+2.4.0 (2015-??-??)
+~~~~~~~~~~~~~~~~~~
+
+* Added `libOpenCM3 <http://docs.platformio.org/en/latest/frameworks/libopencm3.html>`_
+  framework for Nucleo F103RB board
+  (`issue #309 <https://github.com/platformio/platformio/issues/309>`_)
+
 2.3.4 (2015-10-13)
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/docs/frameworks/libopencm3.rst b/docs/frameworks/libopencm3.rst
index dfde004a..a4a3aca7 100644
--- a/docs/frameworks/libopencm3.rst
+++ b/docs/frameworks/libopencm3.rst
@@ -64,6 +64,13 @@ ST
       - 128 Kb
       - 16 Kb
 
+    * - ``nucleo_f103rb``
+      - `ST Nucleo F103RB <https://developer.mbed.org/platforms/ST-Nucleo-F103RB/>`_
+      - STM32F103RBT6
+      - 72 MHz
+      - 128 Kb
+      - 20 Kb
+
 TI
 ~~