diff --git a/DESCRIPTION b/DESCRIPTION
index b8a49da74eb2bfdc423f63e6bb205cbe44d29bde..6184d12121c4f25e15c526ab0a759dd6e6a09114 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -16,7 +16,8 @@ Suggests:
     testthat,
     plyr,
     lattice,
-    latticeExtra
+    latticeExtra,
+    knitr
 Imports:
     Matrix,
     assertthat