If you are looking for a supplemental information letter, here is a sample you can consider.
[Recipient’s Name],
[Recipient’s Address],
{City, State, ZIP],
[Subject: Supplemental Information Letter. Use Bold Formatting]
Respected [Recipient’s Name],
Tandem to the agreement made for [Mention The Reason for which both parties signed the agreement] between [First Party] and [Second Party], this supplemental letter written on [Date] will authorize, define the schedule, scope, and payment conditions for the work to be done on the Project namely: [Mention the name of the Project].
[Mention The Contact Details of the first client. It should include their Name, Address, Contact Number, and Email].
[Mention The Contact Details of the second client. It should also include the same details as above.]
Scope: The Services That [party] will provide will be included in the attachment below.
Schedule: [Mention The schedule of the Project, and it should include the starting and ending date of the Project].
Payment: [Lay down the agreed-upon payment terms between both parties].
Any Other Terms and Conditions: [If any details were agreed upon during the contract signing, mention them here].
[Mention The Name of The First Party]
Signature]
[Mention The Name of The Second Party]
[Signature]
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