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1 files changed, 1 insertions, 1 deletions
diff --git a/docs/library/machine.rst b/docs/library/machine.rst
index 747270d93..b580353d6 100644
--- a/docs/library/machine.rst
+++ b/docs/library/machine.rst
@@ -111,7 +111,7 @@ Miscellaneous functions
varies by hardware (so use substring of a full value if you expect a short
ID). In some MicroPython ports, ID corresponds to the network MAC address.
-.. function:: time_pulse_us(pin, pulse_level, timeout_us=1000000)
+.. function:: time_pulse_us(pin, pulse_level, timeout_us=1000000, /)
Time a pulse on the given *pin*, and return the duration of the pulse in
microseconds. The *pulse_level* argument should be 0 to time a low pulse