diff --git a/portingnotes.html b/portingnotes.html
index 13fd04b..d232db0 100644
--- a/portingnotes.html
+++ b/portingnotes.html
@@ -435,6 +435,7 @@ tr:nth-child(even) {
 
 <table>
   <tr>
+    <th>Symbol</th>
     <th>2.10</th>
     <th>2.12</th>
   </tr>