Texas Property Code - PROP § 5.023. Implied Covenants

(a) Unless the conveyance expressly provides otherwise, the use of “grant” or “convey” in a conveyance of an estate of inheritance or fee simple implies only that the grantor and the grantor's heirs covenant to the grantee and the grantee's heirs or assigns:

(b) An implied covenant under this section may be the basis for a lawsuit as if it had been expressed in the conveyance.