diff --git a/CHANGELOG.md b/CHANGELOG.md
index a557769607..b0c5414f11 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Svelte changelog
 
+## Unreleased
+
+* Add `EventSource` to known globals ([#5463](https://github.com/sveltejs/svelte/issues/5463))
+
 ## 3.28.0
 
 * Add `{#key}` block for keying arbitrary content on an expression ([#1469](https://github.com/sveltejs/svelte/issues/1469))