From mboxrd@z Thu Jan  1 00:00:00 1970
From: ron@ronnatalie.com (Ron Natalie)
Date: Thu, 22 Mar 2018 12:22:06 -0400
Subject: [TUHS] Comments in early Unix systems
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>  i.e. repeating anything i can see from the code (like “returns void”) tells me nothing.

It's right up there with using #defines for silly things like
    #define FOUR 4

Great.   What doe this tell me that the literal 4 doesn't.    It's a matter of time until someone says
    #define FOUR 5

I actually found some code in use that had

#define notdef 1

in it.    I about went through the roof.

Frankly, I have immense distaste for the definition NULL.    Especially those implementations that try to fix it by introducing a spurious cast on it.