Comment Icon Properties
You can add comments to your code with the Comment icon.
Drag the icon to where you want it and add your comments in the icons property box.
Note that the icon is off to one side of the flowchart, as it does not need running so is not a part of the flow as such.
Comments allow users to leave notes in their code explaining functions, explaining variable settings etc., or for any other documentation task that they feel is needed. Leaving comments is a good idea as it helps others understand your code.
See the Comments video to learn how to add comments to your flowchart to describe and explain your program and code.