diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index a56addc1c2..28d303c019 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -105,6 +105,7 @@ Changelog
  * Maintenance: Use util method to construct dummy requests in tests (Jake Howard)
  * Maintenance: Remove unused dev-only react-axe integration (Thibaud Colas)
  * Maintenance: Migrate accessible Skip Link implementation to a Stimulus controller (Loveth Omokaro)
+ * Maintenance: Split up `wagtail.admin.panels` into submodules, existing exports have been preserved (Matt Westcott)
 
 
 4.1.2 (xx.xx.xxxx) - IN DEVELOPMENT
diff --git a/docs/releases/4.2.md b/docs/releases/4.2.md
index 72a29efed3..e7b5e5951d 100644
--- a/docs/releases/4.2.md
+++ b/docs/releases/4.2.md
@@ -136,6 +136,7 @@ This feature was developed by Jake Howard.
  * Use util method to construct dummy requests in tests (Jake Howard)
  * Remove unused dev-only react-axe integration (Thibaud Colas)
  * Migrate accessible Skip Link implementation to a Stimulus controller (Loveth Omokaro)
+ * Split up `wagtail.admin.panels` into submodules, existing exports have been preserved (Matt Westcott)
 
 ## Upgrade considerations