diff --git a/.gitattributes b/.gitattributes
index 28e9d297..1adc275f 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -3,3 +3,5 @@ lib/linguist.rb linguist-language=Java
 test/*.rb linguist-language=Java
 Rakefile linguist-generated
 test/fixtures/* linguist-vendored=false
+README.md linguist-documentation=false
+samples/Arduino/* linguist-documentation