The manifest file is only read on startup and then discarded from memory. Although you can reopen it yourself from your plugin, it is not advisable to add more info in it than what is absolutely needed (especially *much* additional info, like help text). The reason is that the bigger this file is, the longer it takes to read it and these times add up to the app startup time. We should be focusing on minimizing the startup time, not delay it even more...