Update FAQ.md

DOC/FAQ.md

@@ -12,6 +12,7 @@
 * [Can I run a single node?](#can-i-run-a-single-node)
 * [Is rqlite a good match for a network of nodes that come and go -- perhaps thousands of them?](#is-rqlite-a-good-match-for-a-network-of-nodes-that-come-and-go----perhaps-thousands-of-them)
 * [Is it a drop-in replacement for SQLite?](#is-it-a-drop-in-replacement-for-sqlite)
+* [Does rqlite support transactions?](#does-rqlite-support-transactions)
 * [Can I modify the SQLite file directly?](#can-i-modify-the-sqlite-file-directly)
 * [Can I use rqlite to replicate my SQLite database to a second node?](#can-i-use-rqlite-to-replicate-my-sqlite-database-to-a-second-node)
 * [Is the underlying serializable isolation level of SQLite maintained?](#is-the-underlying-serializable-isolation-level-of-sqlite-maintained)
@@ -62,6 +63,9 @@ Unlikely. While rqlite does support read-only nodes, allowing it to scale to man
 ## Is it a drop-in replacement for SQLite?
 No. While it does use SQLite as its storage engine, you must access the system via HTTP. That said, since it basically exposes SQLite, all the power of that database is available. It is also possible that any system built on top of SQLite only needs small changes to work with rqlite.
 
+## Does rqlite support transactions?
+It supports [a form of transactions](https://github.com/rqlite/rqlite/blob/master/DOC/DATA_API.md#transactions). You can wrap a bulk update in a transaction such that all the statements in the bulk request will succeed, or none of them will. However the behaviour or rqlite is undefined if you send explicit `BEGIN`, `COMMIT`, or `ROLLBACK` statements. This is not because they won't work -- they will -- but if your node (or cluster) fails while a transaction is in progress, the system may be left in a hard-to-use state. So until rqlite can offer strict guarantees about its behaviour if it fails during a transaction, using `BEGIN`, `COMMIT`, and `ROLLBACK` is officially unsupported. Unfortunately this does mean that rqlite may not be suitable for some applications.
+
 ## Can I modify the SQLite file directly?
 No, you must only change the database using the HTTP API.