diff --git a/website/rrdworld/rrd4j.xml b/website/rrdworld/rrd4j.xml
--- /dev/null
@@ -0,0 +1,9 @@
+<rrdworld type="companion">
+ <name> RRD4J </name>
+ <author> Sasa Marcovic, Mathias Bogaert </author>
+<description> Rrd4j is a 100% pure java implementation of RRDTool.</description>
+ <homepage> https://rrd4j.dev.java.net/ </homepage>
+ <year> 2006 </year><month> 2 </month>
+ <license> LGPL </license>
+<email> m.bogaert@memenco.com </email> <!-- Author contact -->
+</rrdworld>