docs/esp8266: Add a note concerning GPIO16 pull capabilities.
@@ -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()
