diff --git a/core/box/front_fastlane_box.h b/core/box/front_fastlane_box.h
index 6ff618ed..b2d0af88 100644
--- a/core/box/front_fastlane_box.h
+++ b/core/box/front_fastlane_box.h
@@ -29,7 +29,7 @@
 //   - Fail-fast: Any uncertainty → return not-handled
 //
 // Safety:
-//   - ENV-gated (default OFF)
+//   - ENV-gated (default ON, opt-out)
 //   - Single fallback boundary (FastLane → ColdFallback)
 //   - Reversible (ENV toggle)
 //