With the pace of change of KDE applications, documentation can rapidly become out-of-sync with the application it is describing. To keep its value, documentation needs to be updated. Often this is simply a case of reading the existing documentation, and checking each description of an item against the latest version of the application. For example, are there new items in the menus that are not described in the documentation?
Sometimes, more extensive updates are needed. If new features of the application significantly change the way it works, then new sections of the documentation may be needed, or reorganization of the existing content might be necessary. In particularly severe cases, an entire rewrite might be necessary.