diff --git a/index.html b/index.html
index 09b3221..56e36d0 100644
--- a/index.html
+++ b/index.html
@@ -140,7 +140,7 @@
         <label for="createdBy" style="display:none">Created By</label>
       </div>
       <div class="content">
-        <input id="created" type="text" placeholder="Creation time unspecified" aria-label="Creation time" disabled />
+        <input id="created" type="text" placeholder="Creation time unspecified" aria-label="Creation time" disabled required />
         <br />
         <input id="createdBy" type="text" placeholder="Creation client unspecified" aria-label="Creation client" disabled />
       </div>