diff --git a/CHANGES.md b/CHANGES.md
index f24c2f780..c5aaa2a04 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,7 @@
 
 - cohttp-eio: Don't blow up Server on client disconnections. (mefyl #1011)
 - cohttp-eio: Match body encoding with headers. (mefyl #1012)
+- cohttp-lwt: Preserve extended `Server.S.IO` signature. (mefyl #1013)
 
 ## v6.0.0~beta1 (2023-10-27)
 - cohttp-eio: move new Cohttp.{Client,Server} modules under Cohttp.Generic (mseri #1003)