diff --git a/backfill-ci.py b/backfill-ci.py
index 558bbea..6113842 100644
--- a/backfill-ci.py
+++ b/backfill-ci.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# ONE-SHOT BACKFILL — do not cron. Idempotent but resets all counts. (Ganymede)
 """Backfill CI contributor attribution from git history.
 
 Walks all merged PRs, reclassifies as knowledge/pipeline,