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-rw-r--r--docs/esp8266/tutorial/pins.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/esp8266/tutorial/pins.rst b/docs/esp8266/tutorial/pins.rst
index cd45c83cd3..d304cd55b7 100644
--- a/docs/esp8266/tutorial/pins.rst
+++ b/docs/esp8266/tutorial/pins.rst
@@ -17,7 +17,8 @@ it. To make an input pin use::
>>> pin = machine.Pin(0, machine.Pin.IN, machine.Pin.PULL_UP)
You can either use PULL_UP or None for the input pull-mode. If it's
-not specified then it defaults to None, which is no pull resistor.
+not specified then it defaults to None, which is no pull resistor. GPIO16
+has no pull-up mode.
You can read the value on the pin using::
>>> pin.value()