• TODO

Use TODO to note missing features or functionality that should be added at a later date.

• FIXME

  Use FIXME to note broken code that needs to be fixed.

• OPTIMIZE

Use OPTIMIZE to note slow or inefficient code that may cause performance problems.

• HACK

Use HACK to note code smells where questionable coding practices were used and should be refactored away.

• REVIEW

Use REVIEW to note anything that should be looked at to confirm it is working as intended.

One advantage of using these tags is that they are easy to search for and give an understanding of where the code can be improved.

reference: https://gist.github.com/brun0xff/755438491898e8b12999f9492e537e53