According to the IRS:
“If the spouse can’t sign because of injury or disease and tells the taxpayer to sign for him or her, the taxpayer can sign the spouse’s name on the return followed by the words “By (your name), Husband (or Wife).” A dated statement must be attached to the return. See Publication 501, Dependents, Standard Deduction, and Filing Information, for requirements to include in the statement.”
IRS Pub 501
“Attach a dated statement, signed by you, to the return. The statement should include the form number of the return you are filing, the tax year, and the reason your spouse can't sign, and it should state that your spouse has agreed to your signing for them.”
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