Tracking Changes in the Description Field
You have three ways to track changes in the description field: track what's changing in real time, check the Activity Stream, or go to the version history.
When someone makes a change in the description field, an entry is added to the task, folder, or project’s Activity Stream, showing that a user has updated the description. Click the Updated description text in the Activity Stream to see a pop-up of the changes. If several users were editing the description at the same time, each user’s changes are highlighted with a different color.

The Version History tool allows you to:
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See all changes that have been made in the description field.
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Restore a previous version of the description field's content.
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See when changes were made and by whom.
To see the version history:
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Open a folder, project, or tasks' description field.
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Click the Version History 1 icon on the tool panel.
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The version history pop-up window opens.

The list of all description versions is displayed to the right of the description field content in the pop-up window 1. Each entry contains changes made within a one-minute period or less.
Users who edited this version are listed in the upper-right corner of the description field 2. Each user's profile image is outlined with a colored line 3. That same color is used to highlight all changes made by the user within the description field.

To open the needed description version:
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Click the entry with the needed date and time to the right of the description field. 1
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If multiple changes were made within one minute, the drop-down list with all these versions opens.
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Select the needed version from the list.
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The description to the left changes to the version that was saved at this exact moment.

To restore a version:
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Click the needed entry from the list to the right of the description field.
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Click the Restore 2 button at the bottom of the pop-up window.
The selected version will be displayed in the description field.