diff --git a/src/eval/metrics.py b/src/eval/metrics.py
index b7e896d..e002fbc 100644
--- a/src/eval/metrics.py
+++ b/src/eval/metrics.py
@@ -1 +1,3 @@
 # src/eval/metrics.py — auto-generated stub
+
+# update 4 (2026-04)