Assuming we are thinking solely in terms of Classic Monarch here ....
The Model (and Project) Audits are intended to be self documenting and auditing. As such I think the legacy functionality for editing the model header details (from pre-audit days) looks like is has been dropped. Comment ability seems to have gone as well.
You can, however, add comments to many fields and features.
Calculated fields have a Comments feature (/* Comments */) .
Some other features and functions have specific "Comments" buttons that allow comments to be added, Filters and Functions for example, but not all of them.
At one time I seem to recall that the concept of comments was more widely available but I suspect that hardly anyone used them. (I would have to go back to some old releases to verify that comment!)
Perhaps we have both missed something.?
I'll have a deeper look later if time allows.
Thanks Grant, yes Classic Monarch is what I'm using.
It is also my suspicion that the functionality has been dropped. I used to document my models and leave myself notes about filters and calculated fields since some models only get used occasionally. I upgraded to version 14 this year and the functionality seems to be gone. It seems like it should be simple to leave these text fields in the software. I hate the idea of having to create companion Word docs to document my models.