[Geany] [plugins][geanygendoc] how to use geanygendoc ?

hello im trying to use geanygendoc for php in geany 0.19.1

i have created a function like that :

function test ($a, $b) { return $a; }

so im using the "tools" menu then "document generator" then "document current symbol" -> nothing happens

using "document all symbols" -> nothing happens

i could see that using the right click mouse button, there is a menu called "insert comments" and inside, there is "insert function description" that is giving me : /* * * name: unknown * @param * @return */

cool, but i could use "snippets" for that, i would prefear to see : /* * * name: test * @param $a * @return $a */

there is also "insert documentation comments" but nothing is happening when using it.

so im not able to use geanygendoc

the doc is containing a list of config options and some example that i can not understand on how to use them, i thought that it was "install and play" :)

if someone could provide a quick help on how to use it please ?