diff --git a/.wiki/log.md b/.wiki/log.md
index 78c8483..b348644 100644
--- a/.wiki/log.md
+++ b/.wiki/log.md
@@ -31,3 +31,4 @@ Events: `started`, `promoted`, `registered`, `archived`.
 2026-05-07 designed tdd-criteria (.brainstorm/tdd-criteria.md — domain spec, target promote: claude-skills; 6-round arc with cross-project research via projects-meta)
 2026-05-07 promoted tdd-criteria → claude-skills/.wiki/concepts/tdd-criteria-design.md (commits a03d2804+2ad6f4ce+5fb648d4); tasks created: claude-skills#tdd-criteria-skill-write (ready), claude-skills#tdd-criteria-hermes-mapping (blocked), claude-skills#tdd-criteria-build-install (blocked), claude-skills#tdd-criteria-review (blocked, umbrella per §5)
 2026-05-07 archived tdd-criteria → .archive/2026-05-07-tdd-criteria.md
+2026-05-07 amended tdd-criteria post-promotion: anti-loophole rule 4 (test-immutability + [test-modify: was X; is Y] marker + separate-commit-from-impl) added; user surfaced symmetric vandalism risk on tests after initial promotion. Patches landed: claude-skills#tdd-criteria-skill-write description updated (commit b7819b17), claude-skills#tdd-criteria-precommit-hook task created (commit d440bb52). Design-doc amendment NOT applied directly (knowledge_ingest is create-only — overwrite blocked); amendment text embedded in skill-write task description for impl session to apply via direct git edit.