Okla. Stat. tit. 84, § 146

Any estate, right or interest in lands acquired by the testator after the making of his will, passes thereby and in like manner as if title thereto was vested in him at the time of making the will, unless the contrary manifestly appears by the will to have been the intention of the testator. Every will made in express terms, devising, or in any other terms denoting the intent of the testator to devise all the real estate of such testator, passes all the real estate which such testator was entitled to devise at the time of his decease.