diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index a4370516..0a6e4344 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### New Features
 
 - Extensions and SDK callers can attach a `prepareArguments` hook to any tool definition, letting them normalize or migrate raw model arguments before schema validation. The built-in `edit` tool uses this to transparently support sessions created with the old single-edit schema. See [docs/extensions.md](docs/extensions.md)
+- Extensions can customize the collapsed thinking block label via `ctx.ui.setHiddenThinkingLabel()`. See [examples/extensions/hidden-thinking-label.ts](examples/extensions/hidden-thinking-label.ts) ([#2673](https://github.com/badlogic/pi-mono/issues/2673))
 
 ### Breaking Changes