diff --git a/docs/nostr-event-schemas.md b/docs/nostr-event-schemas.md
index 228615d4..688bf303 100644
--- a/docs/nostr-event-schemas.md
+++ b/docs/nostr-event-schemas.md
@@ -181,6 +181,7 @@ Video posts should treat `videoRootId` as the stable series identifier that rema
 | View counter (`NOTE_TYPES.VIEW_EVENT`) | `WATCH_HISTORY_KIND` (default `30079`) | Canonical tag set: `['t','view']`, a pointer tag (`['e', <eventId>]` or `['a', <address>]`), and a stable dedupe tag `['d', <view identifier>]`, with optional `['session','true']` when a session actor signs; schema overrides may append extra tags. `['video', ...]` is supported for legacy overrides only. | Optional plaintext message |
 | Watch history month (`NOTE_TYPES.WATCH_HISTORY`) | `WATCH_HISTORY_KIND` (default `30079`) | Replaceable list tag `['d', `${WATCH_HISTORY_LIST_IDENTIFIER}:<YYYY-MM>`]` with optional `['month', <YYYY-MM>]` marker plus schema append tags; no chunk pointers required. | JSON payload `{ version, month: 'YYYY-MM', items: [{ id: <eventId\|address>, watched_at?: <unix seconds> }] }` |
 | Subscription list (`NOTE_TYPES.SUBSCRIPTION_LIST`) | `30000` | `['d', 'subscriptions']`, `['encrypted', 'nip44_v2']` (updated to the negotiated scheme at publish time) | NIP-04/NIP-44 encrypted JSON array of NIP-51 follow-set tuples (e.g., `[['p', <hex>], …]`) |
+| Subscription list backup (`NOTE_TYPES.SUBSCRIPTION_BACKUP`) | `30000` | `['d', <identifier>]`, `['encrypted', 'nip44_v2']` | NIP-04/NIP-44 encrypted JSON array of NIP-51 follow-set tuples (e.g., `[['p', <hex>], …]`) |
 | User block list (`NOTE_TYPES.USER_BLOCK_LIST`) | `10000` | `['d', 'user-blocks']` | **LEGACY**. NIP-04/NIP-44 encrypted JSON array of [NIP-51](https://github.com/nostr-protocol/nips/blob/master/51.md) tag tuples. Migrated to standard Mute List (kind `10000`) which uses public tags for mutes and encrypted content for private blocks. |
 | Hashtag preferences (`NOTE_TYPES.HASHTAG_PREFERENCES`) | `30015` | `['d', 'bitvid:tag-preferences']` plus schema-appended `['encrypted','nip44_v2']` | NIP-44 encrypted JSON `{ version, interests: string[], disinterests: string[] }` |
 | Admin moderation list (`NOTE_TYPES.ADMIN_MODERATION_LIST`) | `30000` | `['d', 'bitvid:admin:editors']`, repeated `['p', <pubkey>]` entries | Empty content |