diff --git a/docs/audit/grounding-audit-20260718.md b/docs/audit/grounding-audit-20260718.md
index d2161c0..e414475 100644
--- a/docs/audit/grounding-audit-20260718.md
+++ b/docs/audit/grounding-audit-20260718.md
@@ -287,6 +287,9 @@
    this register (Phase-1 amendments `e999b03`; Phase-2 acceptance +
    drafting directives `c49da79`; Phase-3 acceptance + GA-F02 scope
    `e57f321`; this item).
+6. **Proof-of-push rule (operator, 2026-07-18, standing):** every phase- or
+   step-completion report ends with the `git ls-remote` branch-head hash.
+   "Pushed" without the hash is not a completion report.
 
 Phase-2 review disposition: ACCEPTED on independent external review
 2026-07-18 -- all repo-checkable citations verified; the reviewer executed