Index: en_US.ISO8859-1/books/porters-handbook/uses/chapter.xml
===================================================================
--- en_US.ISO8859-1/books/porters-handbook/uses/chapter.xml
+++ en_US.ISO8859-1/books/porters-handbook/uses/chapter.xml
@@ -1387,8 +1387,10 @@
 
 	    <para>The <literal>gtk3</literal> argument specifies that
 	      the port requires <application>GTK3</application>
-	      features provided by <package
-		role="port">x11/libxfce4menu</package>.</para>
+	      support.  It adds additional features provided by some
+	      core components, for example, <package
+		role="port">x11/libxfce4menu</package> or <package
+		role="port">x11-wm/xfce4-panel</package>.</para>
 	  </entry>
 	</row>