iOS SQLite FMDB Transactions.. Correct usage?

I'm just going to try out using transactions with the FMDB SQLite iOS wrapper.

The documentation is a little vague on transactions but from having a quick look at some functions I have come up with the following logic:

[fmdb beginTransaction];
    // Run the following query
    BOOL res1 = [fmdb executeUpdate:@"query1"];
    BOOL res2 = [fmdb executeUpdate:@"query2"];

if(!res1 || !res2) [fmdb rollback];
else [fmdb commit];