diff --git a/lib/db/dbAdapter.ts b/lib/db/dbAdapter.ts
index 2fb65e13..71806a7a 100644
--- a/lib/db/dbAdapter.ts
+++ b/lib/db/dbAdapter.ts
@@ -1,3 +1,8 @@
+/**
+ * TODO:
+ * This should allow `null` as well, but adding that could be a breaking change to clients.
+ * Additionally set `"strictNullChecks": true` in tsconfig.
+ */
 export type DBValue = boolean | string | number | Buffer | Uint8Array;
 
 export interface DBAdapter {