diff --git a/infra/disclosure-stack/.env.example b/infra/disclosure-stack/.env.example
index 915453e..6301d62 100644
--- a/infra/disclosure-stack/.env.example
+++ b/infra/disclosure-stack/.env.example
@@ -60,6 +60,7 @@ DASHBOARD_USERNAME=admin               # Studio basic-auth
 DASHBOARD_PASSWORD=
 SECRET_KEY_BASE=                       # used by realtime + auth
 VAULT_ENC_KEY=                         # 32-char hex for Supabase Vault
+REALTIME_ENC_KEY=                      # 16 ASCII bytes — AES-128 key for Supabase Realtime. Reusing VAULT_ENC_KEY here crash-loops the container.
 MEILI_MASTER_KEY=
 IMGPROXY_KEY=
 IMGPROXY_SALT=