diff --git a/.agents/checks/CRAB-FIXTURE-01/CHECK.md b/.agents/checks/CRAB-FIXTURE-01/CHECK.md
index 1776abc..8dc083f 100644
--- a/.agents/checks/CRAB-FIXTURE-01/CHECK.md
+++ b/.agents/checks/CRAB-FIXTURE-01/CHECK.md
@@ -18,6 +18,8 @@ hints:
 
 # Synthetic review fixtures
 
+<!-- Integration control: documentation-only change; policy behavior is unchanged. -->
+
 Review the eligible JSON changes for accidentally committed credentials, private
 documents, or real personal data. Fixture records must use clearly synthetic
 values. Keep the assessment within the assigned files and the repository's
diff --git a/tests/repository-checks/README.md b/tests/repository-checks/README.md
index 91798ae..032fc49 100644
--- a/tests/repository-checks/README.md
+++ b/tests/repository-checks/README.md
@@ -21,3 +21,6 @@ The integration test should verify:
 A clean result is expected. These fixtures must not contain real secrets, expose a
 service, execute commands, or introduce a vulnerability. A clean GitHub comment
 alone does not prove that the optional check loaded; confirm that in the trace.
+
+Selector control: mentioning `"review_fixture_version"` in this Markdown file
+does not make it an eligible JSON fixture.
diff --git a/tests/repository-checks/fixture.json b/tests/repository-checks/fixture.json
index b4a2ef5..7524004 100644
--- a/tests/repository-checks/fixture.json
+++ b/tests/repository-checks/fixture.json
@@ -4,7 +4,7 @@
   "records": [
     {
       "record_id": "sample-a",
-      "display_name": "Synthetic Sample A"
+      "display_name": "Synthetic Sample A - selector control"
     }
   ]
 }