I disagree. The code is the best place to comment the why. Regardless of what is documented or what is written up on jira or w/e, the code is what is true.
Commenting the purpose of the code and maybe a link to some documentation allows a future reader to see if the code still fulfills the requirements.
Commenting the purpose of the code and maybe a link to some documentation allows a future reader to see if the code still fulfills the requirements.