diff --git a/fsfe.org/activities/ada-zangemann/drawings.en.xhtml b/fsfe.org/activities/ada-zangemann/drawings.en.xhtml
index a91949d560..1342f69641 100644
--- a/fsfe.org/activities/ada-zangemann/drawings.en.xhtml
+++ b/fsfe.org/activities/ada-zangemann/drawings.en.xhtml
@@ -24,6 +24,7 @@
         <h3>About the book</h3>
         <ul>
           <li><a href="/activities/ada-zangemann/index.html">Overview</a></li>
+          <li><a href="/activities/ada-zangemann/letters.html">Letters to Zangemann</a></li>
           <li><a href="/activities/ada-zangemann/book-reviews.html">Reviews</a></li>
           <li><a href="/activities/ada-zangemann/movie.html">Movie</a></li>
         </ul>
@@ -48,4 +49,4 @@
           <li><a href="/activities/ada-zangemann/index.html#id-get-active">Get Active</a></li>
         </ul>
     </sidebar>
-</html>
\ No newline at end of file
+</html>