I am familiar with programming and figure the ; comments lines out. I am curious if that does comment out those lines making them non readable by the printer why does slicer add lines like

; external perimeters extrusion width = 0.50mm
; perimeters extrusion width = 0.72mm
; infill extrusion width = 0.72mm
; solid infill extrusion width = 0.72mm
; top infill extrusion width = 0.72mm

Is that jsut so you know what the settings are?