diff --git a/index.php b/index.php
index 84e5e91..33550aa 100644
--- a/index.php
+++ b/index.php
@@ -72,7 +72,7 @@
             <div id="header">
                 <h1>FixPhrase</h1>
                 <div><input type="text" placeholder="FixPhrase Words" id="wordbox"/> <button onclick="dolookup();">Find</button></div>
-                <div>Locate any place on Earth with just four words.
+                <div>Locate any place on Earth with just four words. <a href="https://source.netsyms.com/Netsyms/fixphrase.com/src/branch/master/FixPhrase.lib.php">Free and open source</a>.
                     <span class="taptext">Tap</span><span class="clicktext">Click</span> the map to
                     get the unique phrase for that spot. Type a phrase into the search box to
                     pinpoint it on the map.</div>