Need Help Correcting a Probation Extension Letter Mistake – Any Advice?

I need to prepare an amendment letter for my staff. The extension of the probation period was wrongly stated in her letter. Can anyone assist? Thank you very much.

Regards,
Karenna

The letter can be as follows:

To
Mr. [Last Name]
[Company Name]
[Address]

Dear Sir,

Sub: Probation Period Correction

Please refer to the letter dated [date] extending your probation by [number] months. We inform you that the period of extension has erroneously been mentioned as [incorrect number] months. Your probation, in fact, has been extended by [correct number] months. You are advised to note the correction and acknowledge the receipt of this letter.

Yours faithfully,
Competent Authority
B. Saikumar
HR & Labor Law Advisor
Mumbai