Clock drift mitigation suggestion not working

Under `Clock drift and the need for Re-syncing` the following is stated:
> rerun the TrueTime.init call at regular/frequent intervals so you resynchronize with the true time

However looking at the lib code gives:
```
protected void initialize(String ntpHost) throws IOException {
if (isInitialized()) {
TrueLog.i(TAG, "---- TrueTime already initialized from previous boot/init");
return;
}
requestTime(ntpHost);
saveTrueTimeInfoToDisk();
}
```
which effectively skips fetching new time from NTP if value already cached in RAM. (I'm not using saving to prefs option.)

So how can I make the lib sync time every now and then?