diff --git a/AGENTS.md b/AGENTS.md
index b78152a..5f6c092 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -35,3 +35,16 @@ Container image that adds pi coding-agent on top of the opencode-devbox base ima
 - Do NOT call `mempalace-toolkit/install.sh` in the Dockerfile — the base entrypoint handles it
 - `NPM_CONFIG_PREFIX=/usr` must be set per-RUN for any build-time `npm install -g` to keep baked binaries off the volume-shadowed path
 - The smoke test threshold is 2200 MB — update if the image legitimately grows past it
+
+## Documentation drift sweep
+
+Before committing any non-trivial change, check that prose still matches code. Drift hotspots in this repo:
+
+- `README.md` — quick-start examples, env-var table, base-image reference (must match `FROM` in `Dockerfile`).
+- `AGENTS.md` (this file) — `Key facts` block (pi binary path, `NPM_CONFIG_PREFIX`, base-image tag), smoke-test threshold number.
+- `CHANGELOG.md` — promote `Unreleased` only on tag, but record post-release fixes in a fresh `Unreleased` block.
+- `DOCKER_HUB.md` — hand-maintained slim Hub description; sync anything user-facing that changes (env vars, run command, base image).
+- `.env.example` — hand-updated, must match Dockerfile/entrypoint env vars.
+- `Dockerfile` `PI_VERSION` ARG default — if you intend to pin (rather than `latest`), bump it on release.
+
+Quick triage: `git diff --name-only HEAD | xargs -I{} grep -l 'thing-you-changed' README.md AGENTS.md DOCKER_HUB.md CHANGELOG.md .env.example`.