diff --git a/en/08_Changelogs/5.4.0.md b/en/08_Changelogs/5.4.0.md
index f9a3ff28..9a678e97 100644
--- a/en/08_Changelogs/5.4.0.md
+++ b/en/08_Changelogs/5.4.0.md
@@ -142,6 +142,7 @@ SilverStripe\ORM\FieldType\DBPolymorphicForeignKey:
 - [`SSViewer::execute_template()`](api:SilverStripe\View\SSViewer::execute_template()) has been deprecated. It will be removed without equivalent functionality to replace it.
 - [`SSViewer::execute_string()`](api:SilverStripe\View\SSViewer::execute_string()) has been deprecated. It will be removed without equivalent functionality to replace it.
 - [`ThemeResourceLoader::findTemplate()`](api:SilverStripe\View\ThemeResourceLoader::findTemplate()) has been deprecated. It will be removed without equivalent functionality to replace it.
+- [`FlushMiddleware`](api:SilverStripe\Control\Middleware\FlushMiddleware) has been deprecated. It will be replaced with flushing inside the Kernel directly.
 
 ## Bug fixes