diff --git a/doc/sources/admin/changesessionbackend.rst b/doc/sources/admin/changesessionbackend.rst
index 9c6501145..d14c4e2f6 100644
--- a/doc/sources/admin/changesessionbackend.rst
+++ b/doc/sources/admin/changesessionbackend.rst
@@ -45,6 +45,7 @@ Invocation
 Options:
 
 -  ``-c``: job configuration file (mandatory)
+-  ``-r oldkey=newkey``: rename session keys during conversion (optional, can be given multiple times)
 -  ``-i``: ignore errors. By default errors will stop the script
    execution
 -  ``-d``: print debugging output