Your principal concern is clarity for yourself. As a side-effect, it helps your readers too.

I am familiar with assembly language in general but not necessarily 8051 dialect. Most mnemonics are self-explanatory. Some instructions may affect flags in a special way, and it is often helpful to remind yourself.

The actual special function registers of a controller are similar. A reminder of the effect of the bit settings is always useful.

Any of your textbooks will advise on how to comment your programs. You have to make a compromise between clutter and conciseness. This is a personal decision for you.

A sentence or two in regular English explaining what you want to do is always worthwhile. Most ASM instructions will soon be familiar to you.

David.