Comment on a task to ask question, provide more information or offer an insight.
Click on the comment field, type in and click enter
Comments appear in the right side of the page under the task detail pane. Any team member with access to the task can view the conversation and offer a comment. Followers are immediately notified on a new comment.
Comment on a task whenever you want to discuss work with your team. Comments keep your communication in context of the task and is always available for reference purposes at a later date.
So, never forget to comment when you have an update, more information or insight to share!