Saying something is "not enough" is unfortunately not a strong enough justification for adding comments to all functions. Though many functions do need comments, a large percentage (maybe not more than half), of the functions I've seen on projedts simply don't need to be commented.
Always keep in mind that comments interfere with refactoring. It's easy to break up and splity apart the code of a function, but it's time consuming and error prone to do the same for comments.
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