Do I need to enter 401k from previous employer if I haven't contributed anything since leaving?

Hi there, hoping this will make sense... So I left a job 2 years ago and still have the 401k there. My new employer does not offer 401k's, so I don't have one with my new job.  Am I still supposed to enter/declare/whatever you call it, my "old" 401k even though there have been no contributions to it?? Thank you for any help!