diff --git a/public_html/index.html b/public_html/index.html
index e1ad557..24d9760 100644
--- a/public_html/index.html
+++ b/public_html/index.html
@@ -16,7 +16,7 @@ <h1>AfD Statistics Tool</h1>
 <form action="afdstats.py" method="get">
 <table>
   <tr>
-    <td><label>Username:</label></td>
+    <td><label>Username:<span class="small">(case sensitive)</span></label></td>
     <td><input type="text" class="mw-ui-input" name="name" required /></td>
   </tr>
   <tr>