diff --git a/data/about.html b/data/about.html
index c281649aed..5b17b9a033 100644
--- a/data/about.html
+++ b/data/about.html
@@ -43,6 +43,8 @@
 
     <li><a href="http://www.fribidi.org/">GNU FriBidi</a>, <a href="#lgpl21-license">GNU LGPL 2.1</a></li>
 
+    <li><a href="http://www.digip.org/jansson/">Jansson</a>, <a href="#jansson-license">license</a></li>
+
     <li><a href="http://libkdtree.alioth.debian.org/">libkdtree++</a></li>
 
     <li><a href="http://www.freetype.org">The FreeType Project</a>, <a href="#ftp-license">license</a></li>
@@ -446,6 +448,28 @@
   <h3>END OF TERMS AND CONDITIONS</h3>
   <hr />
 
+  <h2 id="jansson-license">Jansson License</h2>
+  <p>Copyright (c) 2009-2013 Petri Lehtinen &lt;petri@digip.org&gt;</p>
+
+  <p>Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:</p>
+
+  <p>The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.</p>
+
+  <p>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.</p>
+  <hr />http://www.digip.org/jansson/
+
   <h2 id="utf8cpp-license">UTF8-CPP License</h2>
 
   <p>Copyright 2006 Nemanja Trifunovic</p>