added a note about threading and applet methods

processing/core/PApplet.java

@@ -197,7 +197,6 @@ public class PApplet extends Applet
   // the thread on, instead of doing it inside paint()
   public void stop() {
     if (thread != null) {
-      //thread.stop();
       thread = null;
     }
 
@@ -223,6 +222,11 @@ public class PApplet extends Applet
   }
 
 
+  // public void destroy() is another one that gets called as the
+  // applet viewer is shutting down the applet. stop() is called
+  // first, and then destroy() to really get rid of things.
+
+
   public Dimension getPreferredSize() {
     return new Dimension(width, height);
   }