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-rw-r--r--docs/library/machine.Timer.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/library/machine.Timer.rst b/docs/library/machine.Timer.rst
index 318443348e..eddb2ce780 100644
--- a/docs/library/machine.Timer.rst
+++ b/docs/library/machine.Timer.rst
@@ -10,6 +10,9 @@ defines a baseline operation of executing a callback with a given period
(or once after some delay), and allow specific boards to define more
non-standard behavior (which thus won't be portable to other boards).
+See discussion of :ref:`important constraints <machine_callbacks>` on
+Timer callbacks.
+
.. note::
Memory can't be allocated inside irq handlers (an interrupt) and so