Can you make a single line comments within a formula?
No, you cannot make comments in a formula field.
If you have a particularly complex formula that you might need to adjust later, you should probably document it elsewhere.
This would be a useful feature! Complex formulas to help create views can be confusing and make it difficult to adjust in the future. Not my highest priority feature, but would be nice.
Would love this! Please add to the Product Suggestions topic!
This would really be a useful addition to make complex formulas easier to understand.