Comment by umbrai_nation

I use them with functions that have too many arguments. It's not always feasible to fix the problem at the source.

damageDealt = calcDamage(weaponType, monsterType, DamageType.FIRE, null /* specialEffectFlags /, false / hasMagicTargeting */ );

It's definitely a code smell, but it's much better than nothing and I'm always glad to see these comments when I come back to the code.