diff --git a/docs/index.html b/docs/index.html
index 9a83b7a..8a6c739 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -12,7 +12,7 @@
   <header>
     <h1>System Bus Radio</h1>
   </header>
-  <p><em>Tested on MacBook Air / Chrome with AM tuner at 1560 Hz. <a href="https://github.com/fulldecent/system-bus-radio/blob/master/TEST-DATA.tsv">See field reports</a> for other equipment and frequencies.</em></p>
+  <p><em>Tested on MacBook Air / Chrome with AM tuner at 1560 kHz. <a href="https://github.com/fulldecent/system-bus-radio/blob/master/TEST-DATA.tsv">See field reports</a> for other equipment and frequencies.</em></p>
   <p>
     <button id="play" onclick="start()">Play tune</button>
     <button id="stop" onclick="end()">Stop tune</button>