diff --git a/docs/changelog-develop.md b/docs/changelog-develop.md
index 9edc4de..bc57d31 100644
--- a/docs/changelog-develop.md
+++ b/docs/changelog-develop.md
@@ -2,6 +2,11 @@
 
 This file documents changes on the develop branch of this project.
 
+## 2026-05-28 — Authentication: session purge
+
+### Added
+- Worker periodically deletes expired rows from `user_sessions` (every 5 minutes).
+
 ## 2026-05-28 — Authentication: Users + Audit UI
 
 ### Added