diff --git a/docs/release.rst b/docs/release.rst
index 3f2394b5..a18d2afd 100644
--- a/docs/release.rst
+++ b/docs/release.rst
@@ -26,6 +26,9 @@ Fix
 Maintenance
 ~~~~~~~~~~~
 
+* Change format() and old string formatting to f-strings and format().
+  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`439`.
+
 * Cleanup ``import``s in ``adhoc/blosc_memleak_check.py``
   By :user:`John Kirkham <jakirkham>`, :issue:`408`.