The flowchart diagrams offer a nice graphics for the return statements and this shape could be used. I decided to introduce one improvement to the shape - to add an icon on the left. The icon serves the purpose of catching the return statements even at a brief glance at a diagram and I consider this as an important touch. The return statements affect the control flow heavily.

As usual, a return expression could occupy many lines and some comments could be supplied. The second example covers this case.