diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fee54c..03c9e88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.3.16] - 2026-08-31
+
+### Changed
+
+- Docs: record analysis_341dfb14 baseline rollout benchmark results
+
+- Feat: add eval-cost benchmark — Geant4 reference vs surrogate rollout timing
+
 ## [0.3.15] - 2026-08-28
 
 ### Changed