Make sure queue limits are boldly specified.

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@@ -99,6 +99,10 @@ changed, and are defined in the NS manual (see Section 7.3).
 	$queue0 set thresh_ 5
 	$queue0 set linterm_ 10
 	$queue0 set q_weight_ 0.002</code></pre>
+
+<em>The maximum <tt>limit_</tt> for a queue is <b>1 megabyte</b> if it is
+specified in bytes, or <b>100 slots</b> if it is specified in slots (each
+slot is 1500 bytes).</em>
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