Yes, exactly this. The reason for writing this article is that I know I often do it wrong. I'm trying hard to make sure that the comments I do write add value

Yes, exactly this. The reason for writing this article is that I know I often do it wrong. I'm trying hard to make sure that the comments I do write add value to future readers of the code (including me), and are not just be a by-product of another deficiency in my coding style (such as poor variable naming, to use one example).