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-rw-r--r--docs/source/lang/api/board-values.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/source/lang/api/board-values.rst b/docs/source/lang/api/board-values.rst
index 367adbb..d6d78f6 100644
--- a/docs/source/lang/api/board-values.rst
+++ b/docs/source/lang/api/board-values.rst
@@ -18,6 +18,12 @@ boards. Some example usages are given :ref:`below
Constants
---------
+- ``CLOCK_SPEED_MHZ``: Clock speed of your board, in megahertz
+ (MHz). This is the same as ``CYCLES_PER_MICROSECOND``.
+
+- ``CLOCK_SPEED_HZ``: Clock speed of your board, in hertz (Hz). This
+ is the same as ``CLOCK_SPEED_MHZ * 1000000``.
+
- ``CYCLES_PER_MICROSECOND``: Number of CPU cycles per microsecond on
your board.