[BUGFIX] Documentaion of Utility function

Change-Id: Ied3b825823c82359878e30363588c5be6081a9dc
Reviewed-on: http://review.typo3.org/32218
Reviewed-by: Tim Lochmüller <tim@fruit-lab.de>
Tested-by: Tim Lochmüller <tim@fruit-lab.de>