diff --git a/CHANGELOG.md b/CHANGELOG.md
index b756244..88f3e49 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,12 @@ Format loosely follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
   home self-hosted runners instead of GitHub-hosted runners. (#5)
 - `docs/runbook.md`: service map, health checks and failure modes (including
   F-0024).
+- `docs/runbook.md`: "Known issues" entry documenting that systemd units
+  created before the scripts moved into `fedora-maintenance/`/`system-health/`
+  subdirectories may still have `ExecStart=` pointing at the old flat repo
+  paths (`status=203/EXEC`), with the fix (point `ExecStart=` at the
+  `/usr/local/bin`/`~/.local/bin` symlink, re-create the symlink if missing,
+  `daemon-reload`).
 
 ### Changed
 
diff --git a/README.md b/README.md
index 1069fcb..708b3b1 100644
--- a/README.md
+++ b/README.md
@@ -84,4 +84,6 @@ bash scripts/test-smoke-selftest.sh
 ## Operating the scripts
 
 See [`docs/runbook.md`](docs/runbook.md) for the service map, health checks
-and known failure modes (including the `203/EXEC` systemd failure, F-0024).
+and known failure modes (including the `203/EXEC` systemd failure, F-0024,
+and a known issue with units installed before the `fedora-maintenance/` /
+`system-health/` reorg).
diff --git a/docs/runbook.md b/docs/runbook.md
index 2d12798..fdc88d6 100644
--- a/docs/runbook.md
+++ b/docs/runbook.md
@@ -41,6 +41,28 @@ script on the workstation.
 | CI `shellcheck`/`actionlint`/`gitleaks` job goes red | Check the failing job in the Actions run | Fix the reported finding (shellcheck warning, workflow lint error, or committed secret — rotate the secret immediately if `gitleaks` finds a real one, then scrub history with the owner's help). | `.github/workflows/ci.yml` |
 | CI jobs don't start or stay queued | Check runner status: the jobs target `runs-on: [self-hosted, home]` (server-dev1/server-dev2) | Confirm the home runners are online (owner-operated hardware, not in this repo's control). | `docs/adr/0001-ci-on-home-self-hosted-runners.md`, F-0704 |
 
+## Known issues
+
+- **Locally installed units may still point at pre-reorg script paths.** The
+  scripts used to live flat at the repo root (`fedora-workstation-scripts/fedora-maintenance.sh`,
+  `.../system-health-check.sh`) and were moved into the `fedora-maintenance/`
+  and `system-health/` subdirectories. Any systemd unit created before that
+  move (or hand-written against an old README) still has
+  `ExecStart=.../fedora-workstation-scripts/fedora-maintenance.sh` (or the
+  `system-health-check.sh` equivalent) and fails with `status=203/EXEC` — this
+  was observed on the owner's workstation (both the `fedora-maintenance` and
+  `system-health` user units) as of 2026-09-13. The current README/unit
+  examples never hit this because they route through a stable
+  `/usr/local/bin/<name>` (or `~/.local/bin/<name>`) symlink instead of a
+  direct repo path (see `fedora-maintenance/README.md` and
+  `system-health/README.md` "Setup (symlinks)" + "Automation"). Fix: point
+  each unit's `ExecStart=` at the symlink, not the repo path, re-create the
+  symlink if missing (`## Quick setup (symlinks)` in the root README), then
+  `systemctl --user daemon-reload` (or `sudo systemctl daemon-reload` for
+  system units). CI now guards against reintroducing this (`scripts/test-smoke.sh`,
+  F-0024), but it cannot fix units already installed on a workstation outside
+  this repo.
+
 ## Data
 
 No database. `bug-bounty-agent/scope.yaml` and `bug-bounty-agent/memory/*.json`