@end group
@end example
-See @code{format}, in @ref{String Conversion}, for other ways to obtain
+See @code{format}, in @ref{Formatting Strings}, for other ways to obtain
the printed representation of a Lisp object as a string.
@end defun
@end defopt
These variables are used for detecting and reporting circular
-and shared structure---but they are only defined in Emacs 21.
+and shared structure:
@tindex print-circle
@defvar print-circle