extended args@ explanation

doc/manual/expressions/language-constructs.xml

@@ -182,8 +182,11 @@ args@{ x, y, z, ... }: z + y + x + args.a</programlisting>
 
   Here <varname>args</varname> is bound to the entire argument, which
   is further matched against the pattern <literal>{ x, y, z,
-  ... }</literal>.</para></listitem>
-
+  ... }</literal>. This <literal>@</literal>-pattern makes only sense with an 
+  ellipsis(<literal>...</literal>) as you can now access attribute names as 
+  <literal>a</literal>, using <literal>args.a</literal>, which was given as an
+  additional attribute to the function.
+  </para></listitem>
 
 </itemizedlist>