How do I log time on a Trello card?

When adding a description, just type a hash (#): a list with all the cards that you are assigned to will pop up.

Select one of the cards, and hit enter. A reference to the card will be inserted.

You can insert multiple card references, and also combine those references with other notes about your work. The only requirement is that you are assigned to the card, otherwise it will not appear in the list.

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