Index: trunk/docs/development/documentation.txt
===================================================================
--- trunk/docs/development/documentation.txt	(revision 588)
+++ trunk/docs/development/documentation.txt	(revision 589)
@@ -10,4 +10,20 @@
     :depth: 2
     :backlinks: top
+
+
+License
+-----------------
+
+The ZOO-Project documentation is released under the
+`Creative Commons Attribution-ShareAlike 4.0 International Public
+License < https://creativecommons.org/licenses/by-sa/4.0/legalcode>`__
+(CC-BY-SA). This license must be kept when editing or creating a new
+documentation file.
+
+.. image:: ../../_static/images/by-sa.png
+   :target: https://creativecommons.org/licenses/by-sa/4.0/legalcode/
+   :height: 31px
+   :width:  88px
+
 
 Background