diff --git a/CHANGELOG.md b/CHANGELOG.md
index 555d05d..ce6d683 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,9 @@ All notable changes to this project will be documented in this file.
 ### Changed
 
 - Changed `ActiveSupport::Notifications` event naming to comply with the recommneded format.
+- Changed `ActiveSupport::Notifications` event so that the 5th yielded argument to the `#subscribe` method is now a
+  `Hash` instead of a `Rack::Attack::Request`, to comply with `ActiveSupport`s spec. The original request object is
+  still accessible, being the value of the hash's `:request` key.
 
 ### Deprecated