Add more reference to min/max sizes.

Author: tabatkins

css3-flexbox/Overview.html

@@ -1881,7 +1881,8 @@ <h2 id=layout-algorithm><span class=secno>7. </span> Flexbox Layout
     doesn't rely on its contents, it's actual main size is calculated per the
     appropriate rules. Otherwise, its main size is the length of its longest
     line, calculated by summing the main sizes of the margin boxes of each
-    flexbox item in the line.
+    flexbox item in the line, constrained by the flexbox's min and max main
+    size constraints.
 
    <li>For each flexbox line, <a
     href="#resolve-the-flexible-lengths"><i>resolve the flexible

css3-flexbox/Overview.src.html

@@ -924,7 +924,7 @@ <h2 id='layout-algorithm'>
 			<p class='issue'>Define "size doesn't rely on its contents". This should be any &lt;length>, a &lt;percentage> that can be resolved, or ''fill-available''.</p>
 		</li>
 
-		<li>Find the actual main size of the flexbox.  If the flexbox's main size doesn't rely on its contents, it's actual main size is calculated per the appropriate rules.  Otherwise, its main size is the length of its longest line, calculated by summing the main sizes of the margin boxes of each flexbox item in the line.</li>
+		<li>Find the actual main size of the flexbox.  If the flexbox's main size doesn't rely on its contents, it's actual main size is calculated per the appropriate rules.  Otherwise, its main size is the length of its longest line, calculated by summing the main sizes of the margin boxes of each flexbox item in the line, constrained by the flexbox's min and max main size constraints.</li>
 
 		<li>For each flexbox line, <i>resolve the flexible lengths</i> of the items contained within it.  All flexbox items now have a final main size.  Update each item's hypothetical cross size based on this main size.</li>