Notes for test plans serve the same purposes as notes for project requirements. Similarly, there can be unlimited number of notes attached to each test plan, while each note can be assigned to any team member and have any amount of documentation files attached to it.
To create, edit, or add attachment to a note for a test plan,
Go to the Project Settings tab.
In the Configuration pane click on the Test Plans link.
In the Test Plan Records list, locate an appropriate test plan and click on the link in the Notes column (The value indicates the number of existing notes for the Test Plan Record).
Test Plan Notes list appears.
All operations with notes for test plans are absolutely identical to operations with notes for project requirements. Refer to the Notes for Requirements articles for further instructions.