According to this clause the policy holder gets 25 % of the base policy sum assured if diagnosed with a terminal illness. (policybazaar.com)
This rider provides the death benefit to the nominee, which is additional to the base policy sum assured in the event of death of the life insured. (comparepolicy.com)
Critical illness cover opted as an add on or rider only provides you with a restricted sum insured, not exceeding the basic health policy sum insured. (comparepolicy.com)