diff --git a/docs/project/readable-codebase/README.md b/docs/project/readable-codebase/README.md
index 2b2e9f0..d0d3d3c 100644
--- a/docs/project/readable-codebase/README.md
+++ b/docs/project/readable-codebase/README.md
@@ -206,8 +206,12 @@ Three rules when you write a ticket file, because the agent reads its ticket and
      which are repo-wide sweeps.
    - **Anchor on a declaration** (`^  onRetry\(\)`), not on a name that may legitimately
      appear elsewhere.
-   - **Keep the Files list consistent with the Acceptance commands.** If a command reaches a
-     file the ticket says not to touch, one of the two is wrong.
+   - **Scope every acceptance command to the ticket's Files list, never to a parent
+     directory.** This is the habit most often broken, including by the supervisor in RD-12:
+     the check `git grep "ActionState" -- apps/ssp/src/app/brief` cannot pass, because
+     `org-template.store.ts` lives in that directory and is deliberately out of scope until
+     RD-13. Name the files. If a command reaches a file the ticket says not to touch, one of
+     the two is wrong.
    - **Prefer a number over a prohibition for anything that must not change.** "Do not rename
      `BriefStatus`" invites reasoning around it; "this count must still be 54, and if it moves,
      revert rather than adjust the number" does not. RD-11 renamed tags across 19 files with a