diff --git a/DESCRIPTION b/DESCRIPTION
index f7d12c9..bcab1f4 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -30,7 +30,7 @@ Suggests:
     knitr,
     lubridate,
     rmarkdown,
-    testthat
+    testthat,
     vdiffr
 VignetteBuilder: knitr
 LinkingTo: