Your company works with freelance writers, and jake, your colleague, is responsible for processing the freelancers' invoices. last week, jake accidentally input $560 instead of $650 on one of the invoices. the writer hasn't contacted you about the error yet, and you need to e-mail her to let her know that there was a mistake and that she should receive the rest of her payment soon.

the following sentence is an excerpt from your e-mail: "jake made an error when he was processing your invoice."

the sentence excerpted from the e-mail usesactive voice. given the purpose of your message, this voiceis appropriate.