Earlier today I have downvoted this answer and left a comment explaining my action. It was something like this:
-1 because this is an unreadable 5 lines long run of words with no formatting or punctuation. Please  your answer to improve it and I'll retract my downvote.
It's a good practice to explain your downvotes, the website will even nudge you with tooltips if you downvote without commenting too much. I've also added the second sentence to explain how voting and edits work here because answer's OP is a low-rep low-activity user.
Now my comment is gone. What was the reason for removing it?