Tex. Ins. Code § 1151.055
An industrial life insurance policy must provide that, after the policy has been in force for two years from its date of issue during the lifetime of the insured, the policy is incontestable except:
(3) concerning a provision relating to:
(B) additional insurance:
Added by Acts 2001, 77th Leg., ch. 1419, Sec. 2, eff. June 1, 2003.