nits and contact

about.html

@@ -66,7 +66,7 @@ <h2>Contributors</h2>
     <li>Yale University</li>
   </ul>
 
-  <h2>Advisory Group</h1>
+  <h2>Advisory Group</h2>
 
   <ul>
     <li><a href='https://pavpanchekha.com/'>Pavel Panchekha</a>, University of Utah</li>
@@ -78,12 +78,20 @@ <h2>Advisory Group</h1>
     <li><a href='https://ztatlock.net/'>Zachary Tatlock</a>, University of Washington</li>
   </ul>
 
-  <h2>Community Meetings</h1>
+  <h2>Community Meetings</h2>
 
   <ul>
     <li><a href='https://fpbench.org/community-meetings.html'>Monthly Talk Series</a></li>
     <li><a href='https://fpbench.org/talks/fptalks23.html'>Annual Workshop</a></li>
   </ul>
 
+  <h2>Staying in Touch</h2>
+
+  <ul>
+    <li><a href='https://groups.google.com/a/fpbench.org/g/fpbench'>Mailing List</a></li>
+    <li><a href='https://join.slack.com/t/fptalks/shared_invite/zt-ft4cn3kn-eZ7WmcozZ37rc0xRGlT5Zg'>Slack</a></li>
+  </ul>
+
+
 </body>
 </html>