history shows different login -CVS

This may be a stupid question, but I noticed today that when I committed/added a new file using a generic "build" login on my linux/redhat system, that the history in CVS shows the previous persons ID.  For example "jdoe" in history and not "build".  I can't seem to figure out how this is assocatied to his ID.  This may not even be a CVS setting, and may be related to an operating system setting, but I thought I'd ask anyway.
 
Thanks for any help.
KM