diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1365ccfa..edc5a0f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 
 For the full list of merged PRs per release, see [GitHub Releases](https://github.com/matt1398/claude-devtools/releases).
 
+## Fork
+
+Development continues in this fork — see the [Upstream sync policy](README.md#upstream-sync-policy). Upstream entries below are kept unchanged.
+
+### Added
+- Session-audit CLI: `pnpm analyze:session` (deep per-session ledger, waste findings, slow subagents, cost estimate) and `pnpm analyze:sessions` (session inventory), with a unified ccusage-style flag grammar (#1).
+
 ## [Unreleased]
 
 ### Added
diff --git a/README.md b/README.md
index fa2d0379..c40c827b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
+> [!NOTE]
+> **Actively maintained fork** of [matt1398/claude-devtools](https://github.com/matt1398/claude-devtools) (upstream dormant since 2026-05). This fork carries new development: session-audit CLI and fixes. See the [Upstream sync policy](#upstream-sync-policy).
+
 <p align="center">
   <img src="resources/claude.png" alt="Your Claude is coding blind" width="600" />
 </p>
@@ -171,6 +174,15 @@ claude-devtools does **not** wrap, modify, or interfere with Claude Code. It rea
 
 ---
 
+## Upstream Sync Policy
+
+This repository is the actively maintained fork of [matt1398/claude-devtools](https://github.com/matt1398/claude-devtools); upstream has been dormant since 2026-05. Upstream is still fetched periodically, but it is not expected to move.
+
+- Local development happens in `main` and feature branches of this fork.
+- Open upstream PRs (e.g. [#235](https://github.com/matt1398/claude-devtools/pull/235)) are closed as "carried in fork" once their changes are applied locally.
+
+---
+
 ## Docker / Standalone Deployment
 
 Run without Electron — in Docker, on a remote server, or anywhere Node.js runs.