diff --git a/changelog.txt b/changelog.txt
index 06bb4380f5..fa4f05f99f 100755
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,6 +1,9 @@
 *** Changelog ***
 
 ## 4.20.0 - 2023-12-14
+### Added
+- Introduce an experimental feature: High-Performance Progress Storage. It allows student progress data to be stored in an optimized way, using custom tables. The feature is disabled by default and can be enabled from the settings page.
+
 ### Changed
 - Open the Lesson editor in the same tab when link is clicked in the Course Outline block [#7344](https://github.com/Automattic/sensei/pull/7344)
 - Rename "View Quiz" block to "Take Quiz" [#7332](https://github.com/Automattic/sensei/pull/7332)
diff --git a/readme.txt b/readme.txt
index 3881dc9e05..63a6930e9a 100644
--- a/readme.txt
+++ b/readme.txt
@@ -145,6 +145,9 @@ Community members have translated the free Sensei LMS plugin [into 18 languages]
 == Changelog ==
 
 ### 4.20.0 - 2023-12-14
+#### Added
+- Introduce an experimental feature: High-Performance Progress Storage. It allows student progress data to be stored in an optimized way, using custom tables. The feature is disabled by default and can be enabled from the settings page.
+
 #### Changed
 - Open the Lesson editor in the same tab when link is clicked in the Course Outline block [#7344](https://github.com/Automattic/sensei/pull/7344)
 - Rename "View Quiz" block to "Take Quiz" [#7332](https://github.com/Automattic/sensei/pull/7332)
@@ -189,4 +192,4 @@ Community members have translated the free Sensei LMS plugin [into 18 languages]
 
 ### 4.19.1 - 2023-11-06
 #### Fixed
-- Email editor styles getting leaked into other templates in site editor [#7258](https://github.com/Automattic/sensei/pull/7258)
\ No newline at end of file
+- Email editor styles getting leaked into other templates in site editor [#7258](https://github.com/Automattic/sensei/pull/7258)