diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..52ceadd13
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# bonsplit is copied in and edited as our own code, so review it and show its diffs.
+vendor/bonsplit/** linguist-vendored=false