diff --git a/Documentation/Sphinx/Acknowledgements.rst b/Documentation/Sphinx/Acknowledgements.rst
old mode 100644
new mode 100755
index b255c9141..57477dc1c
--- a/Documentation/Sphinx/Acknowledgements.rst
+++ b/Documentation/Sphinx/Acknowledgements.rst
@@ -1,4 +1,4 @@
 Acknowledgements
 ================
 
-`SimpleElastix <https://github.com/kaspermarstal/SimpleElastx>`_  is developed and maintained by `Kasper Marstal <https://kaspermarstal.github.io/>`_. `Elastix <http://elastix.bigr.nl>`_ is developed and maintained by Stefan Klein, Erasmus Medical Center, Rotterdam, Netherlands, and Marius Staring, Leiden University Medical Center, Leiden, Netherlands. `SimpleITK <https://github.com/SimpleITK/SimpleITK>`_ is developed and maintained by Bradley Lowekamp and fellow Kitware developers.
\ No newline at end of file
+`SimpleElastix <https://github.com/kaspermarstal/SimpleElastx>`_  is developed and maintained by `Kasper Marstal <https://kaspermarstal.github.io/>`_. `Elastix <http://elastix.bigr.nl>`_ is developed and maintained by Stefan Klein, Erasmus Medical Center, Rotterdam, Netherlands, and Marius Staring, Leiden University Medical Center, Leiden, Netherlands. `SimpleITK <https://github.com/SimpleITK/SimpleITK>`_ is developed and maintained by Bradley Lowekamp and fellow NIAID developers.