diff --git a/DESCRIPTION b/DESCRIPTION
index b0c79a9..a095cd2 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -25,6 +25,7 @@ Suggests:
     ggplot2 (>= 1.0.0),
     knitr (>= 1.11),
     testthat (>= 0.10.0),
+    rmarkdown (>= 0.9.0),
     covr
 Additional_repositories: http://packages.ropensci.org
 LazyData: yes