What is the risk of changing my user account's "full name" mac os x? Why the warning of "might damage this account"? I want to safely change the "full name" for my account. (I only want to change the "full name" – not the "account name" aka "short username").

But, after modifying the field (shown below) and before clicking "OK", this warning shows up:


  WARNING: Changing these settings might damage this account and prevent the user
  from logging in. You must...


How and why would/could this damage my account?
There is no danger in changing the user's full name in this dialog.  Some of the settings on this pane could mess things up. For example:


It's possible to change your shell to something that doesn't exist
Changing your user id can mean that you can't access your files, since they are owned by the old id
Changing the short username might affect all sorts of weird things, since many apps may depend on your username staying the same.