diff --git a/DESCRIPTION b/DESCRIPTION
index ab24be2..b774d6c 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -34,7 +34,8 @@ Suggests:
     knitr,
     rmarkdown,
     pkgdown,
-    devtools
+    devtools,
+    DiagrammeR
 Remotes:
     dviraran/xCell,
     GfellerLab/EPIC,