diff --git a/index.html b/index.html
index 70671a538149cc092eb0e8ffcca5b8d51b9e5f00..93b393a30ef5a9ae93f11db67d995557c96c1dcb 100644
--- a/index.html
+++ b/index.html
@@ -17,12 +17,12 @@
 
 <p>
 
-This page collects ring oscillator timing tests for embedded systems (the prior page is <a href=prior/index.html>here</a>).
+This page collects <a href="#GPIO">GPIO</a> and <a href="#communication">communication</a> ring oscillator timing tests for embedded systems (the prior page is <a href=prior/index.html>here</a>).
 
 <p>
 
 <center>
-<b>GPIO</b>
+<b><a id="GPIO">GPIO</a></b>
 </center>
 
 <p>
@@ -171,7 +171,7 @@ The GPIO test measures how quickly pins can communicate with a processor core; t
 <br><br>
 
 <center>
-<b>Communication</b>
+<b><a id="communication">Communication</a></b>
 </center>
 
 <p>