Index: simulation/raw/30_mixed.html
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--- simulation/raw/30_mixed.html	(revision 7878)
+++ simulation/raw/30_mixed.html	(revision 7879)
@@ -30,7 +30,9 @@
 The xor gate is going to use ngspice's internal model called d_xor. The whole
 model card is specified within the symbol, using the 
 <a href="../../../user/07_io/export_spice/model.html">spice/model_card</a>
-symbol attribute.
+symbol attribute. The spice instance name must start with an 'A' for d_xor,
+while for other workflows the name U1 is more practical. This is fixed
+using the spice/prefix=A attribute.
 <p>
 ADC converters are installed on the input terminals of the xor gate by
 setting the terminal attribute spice/bridge/model to bridge_adc_ttl, which