diff --git a/css.html b/css.html
index 7a8759817..43ed2d9a8 100644
--- a/css.html
+++ b/css.html
@@ -146,7 +146,7 @@ base_url: "../"
           </tr>
           <tr>
             <th>Class prefix</th>
-            <td><code>.col-xs</code></td>
+            <td><code>.col-xs-</code></td>
             <td><code>.col-sm-</code></td>
             <td><code>.col-md-</code></td>
             <td><code>.col-lg-</code></td>