diff --git a/pages/user_documentation.rst b/pages/user_documentation.rst
index dfb0bb82..3a2b163e 100644
--- a/pages/user_documentation.rst
+++ b/pages/user_documentation.rst
@@ -215,6 +215,7 @@ This configuration file is read each time the server is launched. If some
 values are not given, the default ones are used. If no configuration file is
 available, all the default values are used.
 
+
 Logging Configuration File
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -290,6 +291,20 @@ options. These options are available by typing::
   radicale --help
 
 
+Authentication and URLs
+~~~~~~~~~~~~~~~~~~~~~~~
+
+If no authentication method is set, calendars are available at ``/calendar``
+and ``/folder/calendar`` URLs.
+
+If an authentication method is set:
+
+- calendars at ``/calendar`` URLs are available for all the authenticated
+  people;
+- calendars at ``/user/calendar`` URLs are only available for the authenticated
+  person called ``user``.
+
+
 Python Versions and OS Support
 ==============================