diff --git a/vaultwarden/vaultwarden.env b/vaultwarden/vaultwarden.env
index ace389a..b7f0411 100644
--- a/vaultwarden/vaultwarden.env
+++ b/vaultwarden/vaultwarden.env
@@ -1 +1,3 @@
 # Vaultwarden - Pattern B env (folder-mode); ADMIN_TOKEN/DATABASE_URL are Docker secrets
+# 2026-07: DATABASE_URL secret rotated to point at 'postgresql' alias instead of 'db'
+# as part of PostgreSQL HA migration prep (ADR-0001).