diff --git a/CITATION.cff b/CITATION.cff
index 956285c7..03b6108d 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -191,6 +191,7 @@ references:
     email: dewey@fishandwhistle.net
     orcid: https://orcid.org/0000-0002-9415-4582
   year: '2022'
+  url: https://CRAN.R-project.org/package=ggspatial
 - type: software
   title: knitr
   abstract: 'knitr: A General-Purpose Package for Dynamic Report Generation in R'