GLib.KeyFile.prototype.set_comment

function set_comment(group_name: String, key: String, comment: String): Boolean {
    // Gjs wrapper for g_key_file_set_comment()
}
  

Places a comment above key from group_name. If key is null then comment will be written above group_name. If both key and group_name are null, then comment will be written above the first group in the file.

Since 2.6