diff --git a/mps/manual/source/release.rst b/mps/manual/source/release.rst
index b93ffc786f5..4a57665a23b 100644
--- a/mps/manual/source/release.rst
+++ b/mps/manual/source/release.rst
@@ -27,6 +27,15 @@ New features
    calling :c:func:`mps_pool_create_k`.
 
 
+Interface changes
+.................
+
+#. There is now a default value (currently 1 \ :term:`megabyte`) for
+   the :c:macro:`MPS_KEY_ARENA_SIZE` keyword argument to
+   :c:func:`mps_arena_create_k` when creating a virtual memory arena.
+   See :c:func:`mps_arena_class_vm`.
+
+
 Other changes
 .............
 
@@ -44,6 +53,13 @@ Other changes
 
    .. _job003745: https://www.ravenbrook.com/project/mps/issue/job003745/
 
+#. :program:`mpseventtxt` now successfully processes a telemetry log
+   containing multiple labels associated with the same address. See
+   job003756_.
+
+   .. _job003756: https://www.ravenbrook.com/project/mps/issue/job003756/
+
+
 
 .. _release-notes-1.113: