Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Elio Campitelli <eliocampitelli@gmail.com>’
  
  Suggests or Enhances not in mainstream repositories:
    PCICt
  
  Found the following (possibly) invalid URLs:
    URL: https://glossary.ametsoc.org/wiki/Standard_atmosphere
      From: man/standard_atmosphere.Rd
      Status: 403
      Message: Forbidden