diff --git a/DESCRIPTION b/DESCRIPTION
index f9c5c99..d3015f5 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -14,6 +14,7 @@ URL: https://github.com/hadley/r4ds
 Depends: 
     R (>= 3.1.0)
 Imports:
+    feather,
     gapminder,
     ggrepel,
     hexbin,