If a testator, in a will or codicil duly attested, refers to any other document then actually written as expressing any part of his intentions, such document shall be deemed to form a part of the will or codicil in which it is referred to.
PART VI TESTAMENTARY SUCCESSION · CHAPTER III.—Of the Execution of unprivileged Wills
Section 64: Incorporation of papers by reference
The Indian Succession Act, 1925