diff --git a/.gitattributes b/.gitattributes
new file mode 100644
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--- /dev/null
+++ b/.gitattributes
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+# web_dist/ is the prebuilt Flutter web bundle that Vercel serves (see
+# tool/publish_web.sh). It has to stay committed, but it is compiled output,
+# so keep it out of GitHub's language statistics. Without this the repo reads
+# as mostly JavaScript instead of Dart.
+web_dist/** linguist-generated=true
+web_dist/** linguist-vendored=true