gnus-button-man-level

gnus-button-man-level is a variable defined in `gnus-art.el'.
Its value is

5

Documentation:
*Integer that says how many man-related buttons Gnus will show.
The higher the number, the more buttons will appear and the more false
positives are possible. Note that you can set this variable local to
specific groups. Setting it higher in Unix groups is probably a good idea.
See Info node `(gnus)Group Parameters' and the variable `gnus-parameters' on
how to set variables in specific groups.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.