diff --git a/workplans/FLEX-WP-0019-layer-model-conformance.md b/workplans/FLEX-WP-0019-layer-model-conformance.md
index d5ebb49..6c0b85e 100644
--- a/workplans/FLEX-WP-0019-layer-model-conformance.md
+++ b/workplans/FLEX-WP-0019-layer-model-conformance.md
@@ -12,7 +12,13 @@ planning_order: 119
 created: "2026-08-29"
 updated: "2026-08-29"
 reviewed_at: "2026-08-29"
-reviewed_against_commit: "5753b47"
+reviewed_against_commit: "d402408"
+reviewed_note: >-
+  d402408 is the last commit to touch implementation (Go sources and schemas);
+  the assessment was performed with the working tree at 5753b47, and every
+  commit between the two is documentation or work-record only. This field names
+  the implementation state reviewed rather than the HEAD at review time, so it
+  moves when the code moves — which is when the review actually needs redoing.
 origin: history/2026-08-29-layer-model-v0.7-alignment-review.md
 quality_dor: DoR-Ok
 quality_dor_at: "2026-08-29"