diff --git a/src/index.html b/src/index.html
index 83e3c236..1207d9dc 100644
--- a/src/index.html
+++ b/src/index.html
@@ -1218,6 +1218,8 @@ <h3 id="signed-by">Signed by:</h3>
       <li>Scott Werley, Frontend Designer/Developer and Accessibility Specialist, self</li>
       <li>Claire Annan, Consulting Software Engineer, 18F</li>
       <li>Jefté Macêdo, UX researcher and Accessibility Specialist</li>
+      <li>Jon McLaren, Sr. Developer Advocate, HubSpot</li>
+      <li>Mark Wiemer, software engineer specializing in web accessibility at Microsoft</li>
     </ol>
     <p>
       <a class="add-your-name" href="https://github.com/karlgroves/overlayfactsheet/#endorse-this-statement">