--- a/Sphinx/source/plugins/python.rst	Tue Dec 14 17:37:24 2021 +0100
+++ b/Sphinx/source/plugins/python.rst	Tue Dec 14 22:22:37 2021 +0100
@@ -755,6 +755,22 @@
 takes its values from the ``orthanc.ContentType`` enumeration.
 
 
+.. _python_received_instance:
+
+Modifying received instances (new in 3.5 - not released yet)
+...........................................
+
+Starting with release 3.5 of the Python plugin, it is possible to
+modify instances received by Orthanc before they are stored in
+the storage.  This is usually easier to perform modification at this
+stage compared to using the ``/modify`` route once the instances
+has been stored.
+
+.. literalinclude:: python/received-instance-callback.py
+                    :language: python
+
+
+
 Performance and concurrency
 ---------------------------