diff --git a/lib/types/synced-metadata-types.js b/lib/types/synced-metadata-types.js
--- a/lib/types/synced-metadata-types.js
+++ b/lib/types/synced-metadata-types.js
@@ -6,11 +6,18 @@
   +syncedMetadata: SyncedMetadata,
 };
 
+const syncedMetadataNames = Object.freeze({
+  CURRENT_USER_FID: 'current_user_fid',
+});
+type SyncedMetadataName = $Values<typeof syncedMetadataNames>;
+
 export type SetSyncedMetadataEntryPayload = {
-  +name: string,
+  +name: SyncedMetadataName,
   +data: string,
 };
 
 export type ClearSyncedMetadataEntryPayload = {
-  +name: string,
+  +name: SyncedMetadataName,
 };
+
+export { syncedMetadataNames };