One of good practices of writing C/AL Code for Microsoft Dynamics NAV since the dawn of civilization was annotating (commenting) code changes. If you are not sure what I mean by that, this is what I am talking about:
While standards varied about > vs +, or < vs -, or what the annotations should include, there was absolute consensus that annotating changes is an absolute must.
And it was a must. It was such an important rule that everyone followed it without questions asked. In my career, I’ve seen one or two situations of somebody changing or deleting a line of code without leaving any comment, and I’ve seen quite a lot of code, believe you me. It was that important.
It was that important in fact that it was one of the first things developers learned when they signed up for the job, and it was one of the rules they all followed from their first day.