diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 639592c72c..48d500cbe6 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -64,6 +64,7 @@ Changelog
  * Fix: Add missing space in panels check warning message (Stéphane Blondon)
  * Fix: Make sure alt text quality check is on by default as documented (Thibaud Colas)
  * Fix: Prevent `StreamChildrenToListBlockOperation` from duplicating data across multiple StreamField instances (Joshua Munn)
+ * Fix: Prevent database error when calling permission_order.register on app ready (Daniel Kirkham, Matt Westcott)
  * Docs: Move the model reference page from reference/pages to the references section as it covers all Wagtail core models (Srishti Jaiswal)
  * Docs: Move the panels reference page from references/pages to the references section as panels are available for any model editing, merge panels API into this page (Srishti Jaiswal)
  * Docs: Move the tags documentation to standalone advanced topic, instead of being inside the reference/pages section (Srishti Jaiswal)
diff --git a/docs/releases/6.4.md b/docs/releases/6.4.md
index 398db8df95..b65ba2d95b 100644
--- a/docs/releases/6.4.md
+++ b/docs/releases/6.4.md
@@ -139,6 +139,7 @@ Following from a recent audit, this release comes with performance improvements
  * Prevent error on listings when searching and filtering by locale (Matt Westcott, Sage Abdullah)
  * Add missing space in panels check warning message (Stéphane Blondon)
  * Prevent `StreamChildrenToListBlockOperation` from duplicating data across multiple StreamField instances (Joshua Munn)
+ * Prevent database error when calling permission_order.register on app ready (Daniel Kirkham, Matt Westcott)
 
 ### Documentation