Updated FAQ (markdown)

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@@ -106,4 +106,9 @@ Signal--+------|PD0   |
 GND------------|GND   |
                `------'
 R: 1K Ohm resistor
-```
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+```
+
+
+## Arduino Micro with ATMega32U4
+Note that Arduino Micro PCB marking is different from real AVR port name. D0 of Arduino Micro is not PD0, PD0 is D3. Check schematic yourself.
+http://arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
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