[xwiki-users] Customizing editcomment at the space level

Hello, I have enabled the editcomment in my xwiki.cfg file. xwiki.editcomment=1 xwiki.editcomment.mandatory=0 xwiki.editcomment.suggested=1 It works fine, it is a smart feature. Now, I want to disable it for a specific Space of the wiki. In the Admin Guide, I found the following : "You can use the special fields in *XWikiPreferences* object instead of edit *xwiki.cfg*. These fields are: *editcomment*, *editcomment_mandatory*, * editcomment_suggested* and *editcomment_hidden*." Is it possible to apply theses special fields in the WebPreferences of a space ? When I edit the XWiki object, I do not see any editcomment field. Do I have to add it ? Is there any document that describes this ? Thank you for your help. Maxime