diff --git a/index.rmd b/index.rmd
index 2a97666..20a66d5 100644
--- a/index.rmd
+++ b/index.rmd
@@ -28,6 +28,7 @@ options(DT.options = list(paging = F,
                           info = F,
                           dom = "Bfrtip",
                           buttons = c("copy", "excel")))
+pdf(NULL)
 ```
 
 # {.tabset}