diff --git a/index.html b/index.html
index 786948a..c978bed 100644
--- a/index.html
+++ b/index.html
@@ -5,6 +5,34 @@
     <link rel="stylesheet" type="text/css" href="style.css" />
   </head>
   <body>
+    <noscript>
+      <div id="noscript" class="dialog show">
+        <div class="body">
+          <p>
+            <strong>Oops; it looks like JavaScript is not enabled.</strong> I do
+            applaud you for being a cautious user. Unfortunately, you aren't
+            going to get very far without it on this page.
+          </p>
+          <p>
+            There is no need for concern here &mdash; <strong>this game is
+            <a href="http://www.gnu.org/philosophy/free-sw.html">free
+            software</a></strong>, so you can rest assured that we will have
+            full respect for your freedoms and your privacy. Should you wish to
+            take a gander before enabling JavaScript, you may find the full
+            source code on <a
+            href="https://gitorious.org/lasertank-js">Gitorious</a> (I encourage
+            you to take a look either way).
+          </p>
+          <p>
+            Enjoy! (No, I'm sorry, you cannot close this dialog without enabling
+            JavaScript; too many people would simply close it without reading
+            this message. Should you be so inclined, feel free to inspect the
+            <tt>&lt;noscript&gt;</tt> element on this page and remove it.)
+          </p>
+        </div>
+      </div>
+    </noscript>
+
     <div id="game" class="game opening">
       <ul class="menu">
         <li>
diff --git a/style.css b/style.css
index 0138614..3dff171 100644
--- a/style.css
+++ b/style.css
@@ -167,6 +167,9 @@ body {
    * and be hidden */
   z-index: 2000;
 }
+.dialog.show {
+  display: block;
+}
 .dialog > .body {
   position: absolute;
 
@@ -187,6 +190,10 @@ body {
   float: right;
 }
 
+#noscript .body {
+  width: 500px;
+}
+
 #todo .body {
   width: 350px;
 }
