Sample letter informing clients of a change?

Dear [Client's Name],

I am writing to inform you of an upcoming change that will be taking place at our company. Beginning [date], there will be a modification in our [service/product/offering]. This change is being implemented to [reason for change] and we are confident it will result in [benefit to clients]. We appreciate your understanding and support during this transition period.

Sincerely, [Your Name]