info index and info helpindex are automatically generated from information stored in the info and helpfiles respectively. This means that they should not be editted manually as your changes will be lost next time they are built.

info files that should appear in the index need to contain a line starting with @@@ followed by a short (one line) summary of the file's contents.

helpfiles that should appear in the index need to contain a line starting with @@?. Files that should only be listed for admins should follow this code with +adminhelp. Files which should be listed for captains and commanders should follow the code with +wizhelp. After this, a single word or phrase should appear which is the title of the help index section that the file should come under. @@? +wizhelp building would list the file in the captain/commander section of the help index, under building.

see info pagercodes for the complete list of scary things you can do