cperl-info-on-command-no-prompt

cperl-info-on-command-no-prompt is a variable defined in `cperl-mode.el'.
Its value is

nil

Documentation:
*Not-nil (and non-null) means not to prompt on C-h f.
The opposite behavior is always available if prefixed with C-c.
Can be overwritten by `cperl-hairy' if nil.

You can customize this variable.