diff --git a/README.md b/README.md
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@@ -15,6 +15,11 @@ Below, we see the flux guides registered into pockets on the pcb.
 
 <img src='img/bc832-watt-0.jpg' width=40%>
 
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+Notes from previous versions: http://vulpes.cba.mit.edu/rnd/watt/
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 ### Power requirements
 
 The nRF52832 draws 5mA peak @ 3.3V