Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Elisabetta Sciacca <e.sciacca@qmul.ac.uk>’
  
  Suggests or Enhances not in mainstream repositories:
    nestedcv
  Availability using Additional_repositories specification:
    nestedcv   no   ?                                          
    ?           ?   https://CRAN.R-project.org/package=nestedcv
  Additional repositories with no packages:
    https://CRAN.R-project.org/package=nestedcv