Alternat Index file in VSAM upon loading VSAM file

I have a VSAM file which has alternate index defined. Now I am replacing all the data in this file with new data. I am going to use IDCAMS repro for doing this, it should load the data in the
VSAM file, but for the alternate index file, do I need anything special, so that it has the new data reflected or it will be done automatically once I load the data to the original VSAM file.