diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b0d493af..075a3aefa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+- Sprint 9 (Gauntlet) briefing files — server, client, CI, audio, joint — 23 tickets across 4 teams
+
 ### Added
 - Weapon aim lock audio (`sfx_weapon_aim_lock.ogg`) — clinical targeting confirmation tone for weapon aim state (#440)
 - Stance change audio (`sfx_stance_change.ogg`) — subtle mechanical click for stance toggle feedback (#440)