eval with prefix argument

[Gary Wessle]

Hi

I was reading the C-h k C-x C-e, I wanted to print the output of
C-xC-e to the current buffer, it says

****************************************************************
C-x C-e runs the command eval-last-sexp
   which is an interactive compiled Lisp function in `emacs-lisp/lisp-mode'.
(eval-last-sexp EVAL-LAST-SEXP-ARG-INTERNAL)

Evaluate sexp before point; print value in minibuffer.
Interactively, with prefix argument, print output into current buffer.
****************************************************************

I don't understand what prefix argument to give and where in the
sequence of the keys C-x C-e

thanks