Update index.html
diff --git a/content/index.html b/content/index.html
index ca9492e..5220cc1 100644
--- a/content/index.html
+++ b/content/index.html
@@ -37,6 +37,11 @@
</head>
<body>
+ <div style="font-size:x-large;padding:15px;color:white;background:red;">
+ This project has retired. For details please refer to its
+ <a style="color:white;text-decoration:underline" href="https://attic.apache.org/projects/tuweni.html">
+ Attic page</a>.
+ </div>
<nav class="navbar-inverse">
<div class="container-fluid">
