Argument Register Commenting

Is there a way to Comment Argument Registers within a program?

I'm familiar with ARGDISPEG01.DT commenting arguments within in the CALL statement, but I would like the Arguments to be commented inside the subprogram itself (similar to regular Registers)

Example:

R[1:Test_Val] = AR[1:First_Arg]

Quote from Nation

Not to my knowledge. My way around it is that I usually create a header in the program detailing what each argument does for the next guy.

Yep, that's how I currently handle it as well, was hoping for (but not really expecting to find) something cleaner.