Worthy of a revision history note

Author: inexorabletash

index.bs

@@ -6824,6 +6824,7 @@ For the revision history of the second edition, see [that document's Revision Hi
 * Transactions are now temporarily made inactive during clone operations.
 * Added {{IDBTransactionOptions/durability}} option and {{IDBTransaction/durability}} attribute. ([Issue #50](https://github.com/w3c/IndexedDB/issues/50))
 * Specified [[#transaction-scheduling]] more precisely and disallow starting read/write transactions while read-only transactions with overlapping scope are running. ([Issue #253](https://github.com/w3c/IndexedDB/issues/253))
+* Defined [=database=] storage in terms of [[Storage]] primitives.
 
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 # Acknowledgements # {#acknowledgements}