diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac41e0486d..b964579d36 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@
 - Session replay transformed view masking (#4529)
 - UIViewController with Xcode 16 in debug (#4523). The Xcode 16 build setting [ENABLE_DEBUG_DYLIB](https://developer.apple.com/documentation/xcode/build-settings-reference#Enable-Debug-Dylib-Support), which is turned on by default only in debug, could lead to missing UIViewController traces.
 - Concurrency crash with Swift 6 (#4512)
+- Make `Scope.span` fully thread safe (#4519)
 
 ## 8.40.1