Fix index

docs/documentation/grid/columns.html

@@ -17,6 +17,7 @@ doc-subtab: columns
         <li>Add a <code>columns</code> container</li>
         <li>Add as many <code>column</code> elements as you want</li>
       </ol>
+      <p>Each column will have an <strong>equal width</strong>, no matter the number of columns.</p>
     </div>
 
     <div class="columns">