diff --git a/lib/linguist/vendor.yml b/lib/linguist/vendor.yml
index aac05fb2..a77fa417 100644
--- a/lib/linguist/vendor.yml
+++ b/lib/linguist/vendor.yml
@@ -199,3 +199,8 @@
 
 # Mercury --use-subdirs
 - Mercury/
+
+# R packages
+- ^vignettes/
+- ^inst/extdata/
+