How do I add a comment to a task?

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To add a comment to a task, the first thing that needs to be done is to expand the task into a more detailed view. This can be done by clicking on the small, grey arrow to the left of the task title:

The ‘Comments’ field will now be visible:

Click on it and type in your comment. When you are done, click the ‘Add comment’ button:

A notification and email will be sent to the task setter and the other assignees.