diff --git a/docs/projectconf.rst b/docs/projectconf.rst
index 552d96f3..d026b33c 100644
--- a/docs/projectconf.rst
+++ b/docs/projectconf.rst
@@ -205,7 +205,8 @@ format of this option is ``C-like long integer`` value with ``L`` suffix. The
 1 Hertz is equal to ``1L``, then 16 Mhz (Mega Hertz) is equal to ``16000000L``.
 
 The full list of ``board_f_cpu`` for the popular embedded platforms you can
-find in *Boards* section of :ref:`platforms`. See "Frequency" column.
+find in *Boards* section of :ref:`platforms`. See "Frequency" column. You can 
+overclock a board by specifying a ``board_f_cpu`` value other than the default.
 
 
 Building options