diff --git a/index.html b/index.html
index 9d772ee9b0541f88f3a1079afdca8e678df3e4d4..d7c1a7caa0c18a507394b93b2aaace98921e7867 100644
--- a/index.html
+++ b/index.html
@@ -42,7 +42,8 @@
         <label for="unique">output unique lines only</label>
       </div>
     </div>
-    <textarea autofocus placeholder="fill in lines to sort here …" spellcheck="false" autocomplete="off"></textarea>
+    <label for="textarea">Lines to sort or already sorted:</label>
+    <textarea id="textarea" autofocus placeholder="fill in lines to sort here …" spellcheck="false" autocomplete="off"></textarea>
   </main>
 </body>
 <script src="script.js"></script>