diff --git a/rc/tools/comment.kak b/rc/tools/comment.kak
index a0ffa46c..76bf68aa 100644
--- a/rc/tools/comment.kak
+++ b/rc/tools/comment.kak
@@ -115,6 +115,10 @@ hook global BufSetOption filetype=python %{
     set-option buffer comment_block_end "'''"
 }
 
+hook global BufSetOption filetype=(r|rmd) %{
+    set-option buffer comment_line '#'
+}
+
 hook global BufSetOption filetype=ragel %{
     set-option buffer comment_line '%%'
     set-option buffer comment_block_begin '%%{'