Sender: You are required to sign and return hereunder to signify your understanding of the content of Addendum No. 1.
Receiver
: Please find a receipt of the addendum no. 1.
Is this what you want? What should the person do if he does not understand it? I have received and I understand Addendum no.
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I have received and I understand Addendum no. 1.
Signature . . . .
Date . . . . . . . .
Re-write: We have received the content of Addendum No. 1. Please find the duly signed letter for your attention.