Comments are usually added to projects to explain what a programmer wanted parts of the program to do. So they are helpful when collaborating and troubleshooting. 

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Drag a “comment” block and attach it to any block in a stack.

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Type any text, numbers, or symbols into the “comment” block.

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When you finish the comment, click anywhere outside of the comment or press the “Enter” or “Return” key to finish editing the comment.

Note: The inside of the comment block will turn from white to gray when finished. 

For more information, help, and tips, check out the many resources at VEX Professional Development Plus