Describe the work so the client recognises it
Use the project name or deliverable from your agreement. “Design work” invites a question; “Brand identity design, final files” usually doesn’t.
Set a due date you can enforce
A calendar date is harder to misread than a vague note. Keep the agreed payment window in the payment terms as well.
Lines included in this starting point
- Brand identity design
- Frontend development
- Monthly consulting retainer
Replace the examples with the work and prices agreed for the actual job.