Rudder

In the configuration file for rudder, it is stated

1. Interval of time between two dynamic group update batch
2. Expect an int (amount of minutes)
3. If O is given, the dynamic group features will be disabled #

However, setting it to Zero result in the following comment :
[2013-02-14 09:04:09] WARN com.normation.rudder.batch.UpdateDynamicGroups$LAUpdateDyngroupManager - Value '0' for rudder.batch.dyngroup.updateInterval is too small, using '1'

Happens in 2.5, but I suspect it happen on 2.3