documentation.md

@@ -15,6 +15,8 @@ The Orekit Python Wrapper is based on [JCC](http://lucene.apache.org/pylucene/jc
 
 See the [FAQ](faq) for specific issues.
 
+The [orekit forum](https://forum.orekit.org/latest) is also a great source of information.
+
 ## Python
 
 There are lots of Python documentation online, for scientific usage one good starting point is [scipy-lectures](https://scipy-lectures.github.io/)