Please explain what this mget command means exactly

The below commands don't download any files anymore and we don't know why.

lftp -u username,p@ssw0rd sftp://somedomain.example.com
mget -O /a/dir/location/ 201502

The lftp part is quite obvious, but what exactly does the mget command mean?

I think "get contents of remote directory named '201502' and move it to local directory /a/dir/location"

Or is 201502 a search pattern?

Thanks