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-rw-r--r--docs/library/rp2.StateMachine.rst5
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diff --git a/docs/library/rp2.StateMachine.rst b/docs/library/rp2.StateMachine.rst
index 1cb87e90b..4984be0b2 100644
--- a/docs/library/rp2.StateMachine.rst
+++ b/docs/library/rp2.StateMachine.rst
@@ -58,6 +58,11 @@ Methods
- *pull_thresh* is the threshold in bits before auto-pull or conditional
re-pulling is triggered.
+ Note: pins used for *in_base* need to be configured manually for input (or
+ otherwise) so that the PIO can see the desired signal (they could be input
+ pins, output pins, or connected to a different peripheral). The *jmp_pin*
+ can also be configured manually, but by default will be an input pin.
+
.. method:: StateMachine.active([value])
Gets or sets whether the state machine is currently running.