Comments are usually added to projects to explain what a programmer wanted parts of the project to do. So they are helpful when collaborating and troubleshooting.
Drag a [Comment] block and attach it to any block in a stack.
Type any text, numbers, or symbols into the [Comment] block.
When you finish the comment, click anywhere outside of the [Comment] block, or press 'Return' to finish editing the comment.
Note: The inside of the [Comment] block will turn from white to gray when finished.