Notice: Commerce Fieldgroup Panes provides a more extensible solution to this.

This module exposes two fields associated to the order in the checkout phase for Drupal Commerce, one for author and other for comment, this way customer can add a comment to an order for providing feedback or more details.

If you don't need author, just delete the field via UI in Administration » Store » Configuration » Order settings » Manage Fields

Thanks to PieterDC for his original code in #970054: How to implement order comment (for customer to fill in) ?

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