Ohio Rev. Code § 1311.35: Waiver of lien.

The liens in section 1311.34 of the Revised Code are waived by the employee, as to any portion of such labor, unless within thirty days from the expiration of three months from the performance thereof, the employee files with the county recorder of the county where the labor was performed an itemized statement, verified by affidavit, of the amount, kind, and value of the labor performed within such period, with all credits and offsets and the amount then due the employee therefor. The statement, when filed, shall be recorded in the official records, and becomes a lien upon the real property of the employer without any specific description thereof, for the period of one year from the filing of the statement.