diff --git a/paper/paper.bib b/paper/paper.bib
index e57db42..651a6a4 100644
--- a/paper/paper.bib
+++ b/paper/paper.bib
@@ -317,7 +317,7 @@ @Manual{r_AGD
   author = {Stef {van Buuren}},
   year = {2024},
   note = {R package version 0.43},
-  doi = {10.32614/CRAN.package.AGD}
+  doi = {10.32614/CRAN.package.AGD},
   url = {https://CRAN.R-project.org/package=AGD}
 }