diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e338d3..c981b88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Added
+- Accept dates formatted in ISO 8601 extended with combined date and time, for
+example: 2020-08-31T11:04:56Z
+
 ## [0.4.3] - 2021-01-26
 ### Changed
 - Reformat with black