# History Panel

![](/files/-M54XlzF3K9tF3TUrKKl)

Once you do any action with CodexMAV application this action is saved as an operation in the 'History' panel. You can see the name, time and additional information about any operation.

#### Return to operation

![Rollback operation](/files/-LYaIvEAXmAsAJTCQ9ls)

If you want to rollback some operations then you can click on the desired operation and click on 'return' button. All operations that are highlighted with gray color will be canceled.

Note: If you open any analysis state you can't rollback operations that were done and saved in this analysis state because they are irreversible. (see [Save / Open analysis](/codex/mav/user-instructions/save-open-analysis.md))

#### Comments

![Add comment to operation](/files/-LYaJ9HXzKYt6oERa3qr)

Also you can leave a comment to any operation in the 'Comment' column of the history table. 

![Filter operations with not empty comments](/files/-LYaJSFRIzi9VlYHiira)

If you will click on the 'Toggle operations' button then only the ones with a comment will be shown.


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