In the functions comments can be inserted. They have to be included in double quotes ("). If the comment is the last entry to a line, the last double quote can be omitted, the comment ends in any case at the end of the line.
Example:
R1 = 18kOhm "Input impedance
Ua = [R1]/[R2]*[U] "Voltage divider" + [Uo] "Offset voltage