the command @command{return} can be used to continue execution by
returning a value from the current stack frame.
-If @code{debug} is also at least 2, then the code is @emph{partially
+@item > (max 1 speed space compilation-speed)
+If @code{debug} is also at least 2, then the code is @emph{partially
steppable}. If @code{debug} is 3, the code is @emph{fully steppable}.
-@xref{Single Stepping}, for details.
+@xref{Single Stepping}, for details. Fully steppable code take
+exponentially longer to compile in some cases, and is significantly
+larger and slower; for partially steppable code the speed and space
+penalties are signigicantly smaller.
@end table