Comments are adjustable textboxes that can be attached to blocks or scripts. They can be adjusted horizontally (the text relocating to change the height as well), dragged around the screen, and deleted.
A main use for comments is to explain how a script is working. An example is below: File:A script with comments.PNG
The comments are attached to the blocks with a line a pixel thick, making it hard to see with a white background and such.
The type can be changed by clicking the gray triangle at the upper-left of a comment.
Mini comments are one line long and hold a small amount of characters. Full comments display all text entered into it, which can extend infinitely.