* @param string An identifier used for this cache entry
* @param string The variable to cache
* @param array Tags to associate with this cache entry
- * @param integer The lifetime in seconds for this cache entry
+ * @param integer Lifetime of this cache entry in seconds. If NULL is specified, the default lifetime is used. "0" means unlimited liftime.
* @return void
* @author Karsten Dambekalns <karsten@typo3.org>
*/