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@@ -988,6 +988,14 @@ region contains a balanced expression, or try to expand the region so
that it does; it uses the region exactly as it is.
@end table
+If you type @kbd{C-u} before one of these commands, GDS will
+immediately pop up a Scheme stack buffer, showing the requested
+evaluation, so that you can single step through it. (This is achieved
+by setting a @code{<source-trap>} trap at the start of the requested
+evaluation; see @ref{Source Traps} for more on how those work.) The
+Scheme stack display, and the options for continuing through the code,
+are described in the next two sections.
+
@node Displaying the Scheme Stack
@subsection Displaying the Scheme Stack