diff --git a/.gitattributes b/.gitattributes
index b7a7ba911..699a864e1 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -44,3 +44,6 @@ tests/suite/file_without_BOM.txt -text
 
 # Do not normalize on commit.
 *.pdf -text
+
+*.pck linguist-detectable=false
+*.html linguist-documentation=true