diff --git a/DESCRIPTION b/DESCRIPTION
index db6662d..0ce0fb9 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -15,3 +15,5 @@ Imports:
     vctrs,
     purrr,
     methods
+Depends: 
+    R (>= 2.10)
diff --git a/R/sysdata.rda b/R/sysdata.rda
new file mode 100644
index 0000000..8380e3d
Binary files /dev/null and b/R/sysdata.rda differ