diff --git a/index.html b/index.html
index f728702..9313f14 100644
--- a/index.html
+++ b/index.html
@@ -8,6 +8,7 @@
 <body>
   <header>
     <h1>NatoSpell</h1>
+    <p>Type in the field, and a phonetic spelling will appear below. Uses the <a href="https://en.wikipedia.org/wiki/NATO_phonetic_alphabet">NATO phonetic alphabet</a>.</p>
   </header>
   <main>
     <form>
