diff --git a/CLAUDE.md b/CLAUDE.md
index 01632d1..e1538e2 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -77,6 +77,12 @@ The Lite variant is **functionally complete and runtime-verified on Linux + Wind
 
 The detailed milestone plan and design history (the v2 plan, backend artifact/ABI/signing design docs, the v1 plan, chat specs, etc.) are kept **untracked** under `docs/_archive/`.
 
+## Miner updater (xmrig)
+
+The mining tab's pool section has an **"Update miner…"** button that downloads/verifies/installs the latest DRG-XMRig from the project Gitea (`util/XmrigUpdater` + `ui/windows/xmrig_download_dialog.h`). Flow: query `git.dragonx.is/api/v1/repos/DragonX/drg-xmrig/releases/latest` → pick the asset for this platform (`linux-x64` / `win-x64` / `macos-x86_64`; no match → "Unavailable") → libcurl download (TLS verified) → verify the archive **SHA-256** (from the release body) **and** a detached **ed25519 signature** → miniz-extract the binary (flattening the versioned subdir) into `resources::getDaemonDirectory()`. The whole archive is verified, so extracted members are trusted by transitivity (no per-member hash check). The pure, no-I/O core is split into `xmrig_updater_core.cpp` for unit tests; an env-gated (`DRAGONX_TEST_NETWORK=1`) test exercises the worker live.
+
+**Signature verification is enforced** (`kXmrigRequireSignature = true` in `src/util/xmrig_updater.h`), checked against the public key pinned in `kXmrigSignaturePublicKeyBase64`. **Consequence for releases:** every `drg-xmrig` release MUST ship a detached signature per archive or the in-app updater refuses it. To cut a release: build the archives, then `scripts/sign-xmrig-release.sh sign <secret.key> <archive.zip>...` (OpenSSL-based, no extra deps) and upload each `<archive>.sig` as a release asset alongside its `.zip`. The signing **secret key must stay offline** (it is gitignored: `*.ed25519.key`); only its base64 public key is pinned in the source. To rotate the key, regenerate (`scripts/sign-xmrig-release.sh keygen`) and update `kXmrigSignaturePublicKeyBase64`. An emergency env override is not provided — disabling verification means setting `kXmrigSignaturePublicKeyBase64` empty (and rebuilding).
+
 ## Versioning
 
 The version has a **single source of truth**: `project(... VERSION 1.2.0 ...)` plus `DRAGONX_VERSION_SUFFIX` in `CMakeLists.txt`. CMake generates `build/.../generated/dragonx_generated_version.h` from `src/config/version.h.in`. Do not hand-edit generated version output or hardcode version strings — bump the `project()` version in `CMakeLists.txt`.