diff --git a/templates/index.html.ep b/templates/index.html.ep
index 873c0a7..646ddf5 100644
--- a/templates/index.html.ep
+++ b/templates/index.html.ep
@@ -3,6 +3,11 @@
   <head>
 		<% my $plain_title = $title; $plain_title=~s/<[^>]+>//g; %>
     <title><%= $plain_title  %>:<%= $word %> · IDS word vector analysis</title>
+%# Result pages are computed for one word each and there is one for every
+%# word of the vocabulary, so they are not something to index or to follow.
+% if (stash 'noindex') {
+    <meta name="robots" content="noindex, nofollow">
+% }
     <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
     <link href="https://fonts.googleapis.com/css?family=Lato|Roboto+Condensed" rel="stylesheet">
     <script src="https://code.jquery.com/jquery-latest.min.js"></script>