diff --git a/static/install.html b/static/install.html
index 829b0726..c70fd875 100644
--- a/static/install.html
+++ b/static/install.html
@@ -186,10 +186,10 @@ Installed as /home/username/downloads/platform-tools/fastboot</pre>
             </ul>
 
             <p>On Debian-based distributions, the <code>signify</code> package and command are an
-            <a href="http://signify.sourceforge.net/">unmaintained mail-related tool for
-            generating mail signatures (not cryptographic signatures)</a> with the final releases
-            from 2003-2004 made directly by the developer via the Debian package without upstream
-            releases. Please pressure them to correct this usability issue.</p>
+            <a href="http://signify.sourceforge.net/" rel="nofollow">unmaintained mail-related
+            tool for generating mail signatures (not cryptographic signatures)</a> with the final
+            releases from 2003-2004 made directly by the developer via the Debian package without
+            upstream releases. Please pressure them to correct this usability issue.</p>
 
             <h2 id="enabling-oem-unlocking">
                 <a href="#enabling-oem-unlocking">Enabling OEM unlocking</a>