--- a/Sphinx/source/contributing.rst	Tue Jun 30 11:58:03 2020 +0200
+++ b/Sphinx/source/contributing.rst	Fri Jul 03 09:33:10 2020 +0200
@@ -22,9 +22,9 @@
   - Answer questions posted to the `mailing list
     <https://groups.google.com/forum/#!forum/orthanc-users>`_.
   - Improve the text of the `Orthanc Book and REST API documentation
-    <https://hg.orthanc-server.com/orthanc-book/file/tip>`__ (check
+    <https://hg.orthanc-server.com/orthanc-book/file/default>`__ (check
     out the instructions provided in the `README file
-    <https://hg.orthanc-server.com/orthanc-book/file/tip/README.md>`__,
+    <https://hg.orthanc-server.com/orthanc-book/file/default/README.md>`__,
     and send us a :ref:`simple patch <hg-patch>`).
   - Provide documentation and use cases (inside the dedicated `GitHub
     repository <https://github.com/jodogne/OrthancContributed>`_, via