Teacher - how to give students extra points?

Example: A teacher assigns a voluntary homework to students. Some students worked out the homework, some did not. The teacher wants to evaluate activity (students, who made HW) with extra points.

The teacher clicks to create a new assignment (new column) in the grade book.

He chooses type of evaluation - points. Teacher sets the maximum points to 0, e.g. all obtained points are "extra points".

Extra point must teacher write manually.

The teacher chooses "Publish in the grade book".