Index: trunk/doc/faq.html
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 <h1> pcb-rnd FAQ </h1>
 
+<h2 id="slots"> padstacks </h2>
 
+<h3> Intern copper layer shape not rendering </h3>
+<p>
+Does the padstack has a hole? Does the hole drill through any internal
+copper layer (in non-thru-hole case)?
+<p>
+Internal copper layers are special: there are multiple of them. The padstack
+will place the intern shape on any internal copper layer that the padstack's
+hole reaches. If the padstack has no hole, no internal layer shape is
+rendered, even if it is specified.
+
+
 <h2 id="slots"> slots (oval holes) </h2>
 
 <h3> My slot doesn't show up on screen or in exports </h3>