You can comment two different ways in Slite - for the doc as a whole, or via highlighted text.
Writing comments
Comments for the doc as a whole
Just click on the icon in the top left of a doc to get started.
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Comments on highlighted text
The "inline thread" style of comments are only accessible to teammates with Write permissions in the channel. Highlight the text you wish to comment with your cursor and click the + icon in the toolbar.
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Tips
You can create a line break by hitting shift+enter
You can add note links and mention people in your comment with @+name
Resolving comments
When to resolve
You can resolve comments once the points have been addressed, to tidy your doc. Just click on the "Resolve" button in the top right of an individual comment.
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Viewing resolved threads on desktop
Head to the three-dot menu in the top right of your doc to Show resolved comments, if you find you need them again later.
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Deleting comments
Use the three-dot menu in the top right of a comment to delete the thread.
Delete thread
Converting comments to questions & answers
You can convert comments to Questions & Answerswith to-do date, participants, and a clear owner, when simple comments won't suffice. Just click on the three-dot menu in the top right of a comment and select Convert to question.