diff --git a/docs/release.rst b/docs/release.rst
index 8ce4b2e33c..815228fe00 100644
--- a/docs/release.rst
+++ b/docs/release.rst
@@ -21,6 +21,9 @@ Unreleased
 * Change occurrences of % and format() to f-strings.
   By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>` :issue:`1423`.
 
+* Add more typing to zarr.util.
+  By :user:`David Stansby <dstansby>` :issue:`1617`.
+
 .. _release_2.17.0:
 
 2.17.0