--- a/webaudio/specification.html	Tue Dec 04 14:30:08 2012 -0800
+++ b/webaudio/specification.html	Tue Dec 04 14:35:59 2012 -0800
@@ -1515,7 +1515,8 @@
 
     <li>
     An AudioParam will take the rendered audio data from any AudioNode output connected to it and <a href="#down-mix">convert it to mono</a> by down-mixing if it is not
-    already mono, then mix it together with other such outputs.
+    already mono, then mix it together with other such outputs.  If there are no AudioNodes connected to it, then this value is 0, having no
+    effect on the <em>computedValue</em>.
     </li>
 
     <li>