diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index bc6fc8f740..8afa76af07 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -6,6 +6,7 @@ Changelog
 
  * Add `WAGTAIL_` prefix to Wagtail-specific tag settings (Aayushman Singh)
  * Implement `normalize` on `TypedTableBlock` to assist with setting `default` and `preview_value` (Sage Abdullah)
+ * Apply normalization when modifying a `StreamBlock`'s value to assist with programmatic changes to `StreamField` (Matt Westcott)
  * Fix: Take preferred language into account for translatable strings in client-side code (Bernhard Bliem, Sage Abdullah)
  * Docs: Add missing `django.contrib.admin` to list of apps in "add to Django project" guide (Mohamed Rabiaa)
 
diff --git a/docs/releases/6.5.md b/docs/releases/6.5.md
index 3b8a4a0663..69fd2323d7 100644
--- a/docs/releases/6.5.md
+++ b/docs/releases/6.5.md
@@ -15,6 +15,7 @@ depth: 1
 
  * Add `WAGTAIL_` prefix to Wagtail-specific tag settings (Aayushman Singh)
  * Implement `normalize` on `TypedTableBlock` to assist with setting `default` and `preview_value` (Sage Abdullah)
+ * Apply normalization when modifying a `StreamBlock`'s value to assist with programmatic changes to `StreamField` (Matt Westcott)
 
 ### Bug fixes