diff --git a/documentation/NOTES.md b/documentation/NOTES.md
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--- a/documentation/NOTES.md
+++ b/documentation/NOTES.md
@@ -1,4 +1,5 @@
 # introduction
+* [c3d2 wiki](https://wiki.c3d2.de/C3D2-Web)
 * [Darstellung von XML-Daten](http://de.selfhtml.org/xml/darstellung/index.htm)
 * [How Not to Use XSLT](http://www.sims.berkeley.edu/academics/courses/is290-8/s04/lectures/5/dragons/allslides.html)
 * http://bobcat.webappcabaret.net/javachina/faq/xpath_01.htm#xpath_Q15 (b0rked?)