is a comment, it removes comment delimiters from each; otherwise, it
adds comment delimiters to each.) If you are not using Transient Mark
mode, then you should use the commands @code{comment-region} and
-@code{uncomment-region} to do these jobs (@pref{Multi-Line Comments}).
+@code{uncomment-region} to do these jobs (@pxref{Multi-Line Comments}).
A prefix argument used in these circumstances specifies how many
comment delimiters to add or how many to delete.