Give credit where it is due.

index.html

@@ -714,10 +714,12 @@ <h3>Types of Search Option</h3>
 
     <section>
       <h2 id="Acknowledgements" class="informative">Acknowledgements</h2>
-      <p>The W3C Internationalization Working Group and Interest Group, as well as others, provided many comments and suggestions. The Working Group would like to thank: all of the contributors to the Character Model series of documents over the many years of their development. </p>
+      <p>The W3C Internationalization Working Group and Interest Group, as well as others, provided many comments and suggestions. The Working Group would like to thank: all of the contributors to the Character Model series of documents over the many years of their development.</p>
+
+      <p>The examples in <a href="text-frag-lang"></a> were taken from a page authored by Henri Sivonen, as were a number of concepts and ideas recorded by him in <a href="https://github.com/WICG/scroll-to-text-fragment/issues/233">this issue</a>.</p>
     </section>
 
-    <section lang="de">
+    <section id="text-frag-lang" lang="de">
 	<h2 lang="en">Text fragment language</h2>
 	<p lang="en">This section was borrowed from an example page by Henri Sivonen.</p>
     <p lang="en">