It is often stated that code comments exist so other coders can understand what it is your code is supposed to do. The truth however is that comments are added so your future self can make sense of the code you wrote.
Coding is by nature a rapid iteration of skill development. Which is why code that was made just the day before can look complete alien of even crazy.
Of course leaving off in the middle of coding can get you even more lost unless you leave some kind of marker behind.