diff --git a/src/xdocs/sponsoring.xml b/src/xdocs/sponsoring.xml
index 5a1973911..85488b265 100644
--- a/src/xdocs/sponsoring.xml
+++ b/src/xdocs/sponsoring.xml
@@ -29,6 +29,8 @@
         <a href="https://www.bountysource.com/teams/checkstyle">bountysource - checkstyle</a>
         <br/>
         <a href="https://gratipay.com/checkstyle/">gratipay - checkstyle</a>
+        <br/>
+        <a href="https://flattr.com/submit/auto?fid=g39d10&amp;url=http%3A%2F%2Fcheckstyle.sourceforge.net" target="_blank"><img src="https://button.flattr.com/flattr-badge-large.png" alt="Flattr this" title="Flattr this" border="0"/></a>
       </p>
 
       <p>