diff --git a/DESCRIPTION b/DESCRIPTION
index ce72fd4..11e0e64 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -26,7 +26,9 @@ Suggests:
     doParallel,
     testthat,
     knitr,
-    rmarkdown
+    rmarkdown,
+    parallel,
+    splines
 VignetteBuilder: knitr
 Roxygen: list(markdown=TRUE)
 RoxygenNote: 7.1.1