diff --git a/source/release-notes/2.4-upgrade.txt b/source/release-notes/2.4-upgrade.txt
index f7c81c37be1..bb9dd590538 100644
--- a/source/release-notes/2.4-upgrade.txt
+++ b/source/release-notes/2.4-upgrade.txt
@@ -59,11 +59,9 @@ metadata in any other way.
 .. note::
 
    The upgraded config database will require more storage space than
-   before, though this storage increase represents a fraction of the
-   current config database size. The additional storage requirement
-   will be much less for deployments that have run with 2.2 for a
-   non-trivial period of time. As always, if storage requirements
-   increase, the :program:`mongod` might need to pre-allocate
+   before, to make backup and working copies of the config.chunks and
+   config.collections collections.
+   As always, if storage requirements increase, the :program:`mongod` might need to pre-allocate
    additional data files. See
    :ref:`faq-tools-for-measuring-storage-use` for more information.