added "If you want to emulate" additional wording to deprecation of system colors, per feedback in issue 22 - http://wiki.csswg.org/spec/css3-color#issue-22

Author: Tantek Çelik

css3-color/Overview.src.html

@@ -1688,7 +1688,7 @@ <h4 id="css2-system">CSS2 system colors</h4>
 <p class="note"><strong>Note.</strong> The computed value of a System Color 
 keyword value is the keyword itself.</p>
 
-<p>The CSS2 System Color values have been deprecated in favor of the CSS3 UI '<a href="http://www.w3.org/TR/css3-ui/#appearance" class="index-inst">appearance</a>' property for specifying the complete look of user interface related elements.</p>
+<p>The CSS2 System Color values have been deprecated in favor of the CSS3 UI '<a href="http://www.w3.org/TR/css3-ui/#appearance" class="index-inst">appearance</a>' property. If you want to emulate the look of a user interface related element or control, please use the 'appearance' property instead of attempting to mimic a user interface element through a combination of system colors.</p> 
 
 
 <h3 id="notes">Notes on using colors</h3>