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-rw-r--r--docs/esp8266/quickref.rst3
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diff --git a/docs/esp8266/quickref.rst b/docs/esp8266/quickref.rst
index e17b60f67..95e1fcf97 100644
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+++ b/docs/esp8266/quickref.rst
@@ -108,6 +108,9 @@ with timer ID of -1::
The period is in milliseconds.
+By default, timer callbacks are scheduled as soft interrupts on this port.
+Specify ``hard=True`` to run them in hard interrupt context instead.
+
Pins and GPIO
-------------