diff --git a/books/pru-cookbook/01case/case.rst b/books/pru-cookbook/01case/case.rst
index 030aba4f983e2046881a480d8200bf18b3172835..a0984eea2104da1830d9903dd1acd0c5496afd98 100644
--- a/books/pru-cookbook/01case/case.rst
+++ b/books/pru-cookbook/01case/case.rst
@@ -1085,7 +1085,6 @@ multi-copters, traditional helicopters, fixed wing aircraft and rovers. ArduPilo
    institutions and corporations such as NASA, Intel and Insitu/Boeing, as well as countless 
    colleges and universities around the world.
 
-   http://www.machinekit.io/about/
 
 .. rubric:: Footnotes