Update README.md

PY1CX · Aug 19, 2017 · 530266e · 530266e
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@@ -8,4 +8,7 @@ I always wanted to build a RF Wattmeter with the AD8307 and OZ2CPU design. I was
 ### Inside the Hammond 1590B box
 ![Preview](https://github.com/PY1CX/AD8307-RF-Wattmeter/blob/master/InsideBox.png?raw=true)
 
+ATTENTION:
+For V1.0 boards, the PCB project suffer from a pin swap on MC78L05. Pin 1 and Pin 3 are swapped, you MUST correct it on your building or your PIC will die from overvoltage.
+
 Original Schematic and Software: http://www.webx.dk/oz2cpu/radios/miliwatt.htm