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Section 8: Renunciation of citizenship
(1) If any citizen of India of full age and capacity, makes in the prescribed manner a declaration renouncing his Indian Citizenship, the declaration shall be registered by the prescribed authority; and, upon such registration, that person shall cease to be a citizen of India: Provided that if any such declaration is made during any war in which India may be engaged, registration thereof shall be withheld until the Central Government otherwise directs. (2) Where a person ceases to be a citizen of India under sub-section (1), every minor child of that person shall thereupon cease to be a citizen of India: Provided that any such child may, within one year after attaining full age, make a declaration in the prescribed form and manner that he wishes to resume Indian citizenship and shall thereupon again become a citizen of India.
Source: official text of The Citizenship Act, 1955 as published on India Code (PDF). All sections of the Citizenship Act, 1955.