Update toroid.html

toroid.html

@@ -65,7 +65,7 @@
             <div id="notes" class="notes">
             <br>
             <b><u>Notes:</u></b><br>
-            RF Toroid Calculator was developed to help users predict the RF characteristics of a ferrite toroid wound as an inductor or suppressor. 
+            RF Toroid Calculator was developed to help users predict the RF characteristics of a ferrite or powdered-iron toroid wound as an inductor or suppressor. 
             It uses the manufacturer's (Fair-Rite & Micrometals) published data including the toroid's dimensions and complex permeability characteristics
             to predict the component's characteristics.<br>
             The calculator has 4 separate display areas. At the top is the chart display for showing frequency-dependent characteristics. Next is the