diff --git a/.gitattributes b/.gitattributes
index 91f59ffc..1794c82f 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -51,3 +51,5 @@ Containerfile  text eol=lf
 # Lock files
 Cargo.lock  text eol=lf -diff
 deno.lock   text eol=lf -diff
+# Pending estate-wide policy: hide ReScript from primary-language detection.
+**/*.res linguist-detectable=false