diff --git a/docs/guard-inventory.md b/docs/guard-inventory.md
index e622de0b9..9e091de63 100644
--- a/docs/guard-inventory.md
+++ b/docs/guard-inventory.md
@@ -12,8 +12,10 @@ and `dotnet format`, and `grep -rn pytest .husky/` returns nothing. The runner i
 `docker-build.yml:723` on the release path, which re-runs two of these files
 (`test_ci_dropped_step_guard.py` and `test_ci_release_path_scan_job.py`) as a `needs:` of `build`.
 
-**Read `docs/decisions/records/testing/guard-derives-population-from-source.md` and
-`…/guard-ships-with-mutation-proof.md` before editing a guard or adding a row.**
+**Read `docs/decisions/records/testing/guard-derives-population-from-source.md`,
+`…/guard-ships-with-mutation-proof.md` and — for the SHAPE of the predicate itself, whenever it
+decides by reading shell or config TEXT — `…/guard-pins-the-artifact-not-a-shape.md` before editing
+a guard or adding a row.**
 
 ## Columns