diff --git a/backend/app/services/migrators/__init__.py b/backend/app/services/migrators/__init__.py
index 0a7154c..b7c0908 100644
--- a/backend/app/services/migrators/__init__.py
+++ b/backend/app/services/migrators/__init__.py
@@ -1,6 +1,10 @@
 """FC-5 migration tooling.
 
-One module per concern (backup/rollback/gs/ir/overlap/ml_queue/verify).
+One module per concern (gs/ir/overlap/ml_queue/verify/cleanup).
 Each migrator returns a counts dict; the run_migration task wires
 that dict into MigrationRun.counts so the UI polling shows progress.
+
+backup + rollback were retired in FC-3h (2026-05-24); first-class
+backup lives at backend/app/services/backup_service.py and exposes
+its own /api/system/backup/* surface.
 """