Privileges for read-only tables with sequence and foreign keys

To allow read-only access, ie. SELECT, to a user on a table which has a SERIAL column as well as foreign key references do I need to GRANT the user anything other than SELECT on the table and its corresponding sequence? As I understand, USAGE is only required to modify the table or use the currval function while REFERENCES is only required to create a foreign key, not to make use of it.

gvim