diff --git a/CHANGELOG.md b/CHANGELOG.md
index fe89d3a43..d094ef960 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@
 - Hooks: default hook agent delivery to true. (#533) — thanks @mcinteerj
 - Hooks: normalize hook agent providers (aliases + msteams support).
 - WhatsApp: route queued replies to the original sender instead of the bot's own number. (#534) — thanks @mcinteerj
+- iMessage: isolate group-ish threads by chat_id. (#535) — thanks @mdahmann
 - Models: add OAuth expiry checks in doctor, expanded `models status` auth output (missing auth + `--check` exit codes). (#538) — thanks @latitudeki5223
 - Deps: bump Pi to 0.40.0 and drop pi-ai patch (upstream 429 fix). (#543) — thanks @mcinteerj
 - Agent: skip empty error assistant messages when rebuilding session context to avoid tool-chain corruption. (#561) — thanks @mukhtharcm