diff --git a/src/main/webapp/index.html b/src/main/webapp/index.html
index 1f86b15..e526de2 100644
--- a/src/main/webapp/index.html
+++ b/src/main/webapp/index.html
@@ -50,7 +50,10 @@
             <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                 <ul class="nav navbar-nav">
                     <li>
-                        <a href="https://github.com/moparisthebest/phonehash">About</a>
+                        <a href="https://github.com/moparisthebest/phonehash">How</a>
+                    </li>
+                    <li>
+                        <a href="https://github.com/kontalk/androidclient/issues/497">Why</a>
                     </li>
                     <li>
                         <a href="https://github.com/moparisthebest/phonehash">Code</a>
@@ -70,9 +73,9 @@
 
         <div class="row">
             <div class="col-lg-12 text-center">
-                <h1>Enter a kontalk phone number hash</h1>
+                <h1>Enter a <a href="https://kontalk.net">Kontalk</a> phone number hash</h1>
                 <p class="lead">Get a phone number back (currently supports 0-000-000-0000 to 9-999-999-9999)</p>
-                <input name="hash" type="text" id="hash" size="40" maxlength="40"/><button type="button" id="unhash">Unhash</button>
+                <input name="hash" type="text" id="hash" size="40" maxlength="40" title="Kontalk Hash (40 character hex sha1)" pattern="^[0-9a-fA-F]{40}$" placeholder="80808080ccdd107488bad45a74b3c5755c4bd108"/><button type="button" id="unhash">Unhash</button>
                 <h1 id="result"></h1>
             </div>
         </div>