database changes during a pg_dump

If I do a

pg_dump -Fc dbname -U postgres > backup.out

to backup a database am I right to assume that any changes made to the database such as a row update that are made while the pg_dump is actually  running will be captured in the resulting backup.out file?

Thanks

Austen

Austen Birchall  Senior Database Administrator
Met Office FitzRoy Road Exeter EX1 3PB United Kingdom