diff --git a/build.sh b/build.sh
index 57f71cc..29f8ccd 100755
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,5 @@
 mkdir -p build/@picocss/pico/css/
-cp *.png *.xml *.svg *.css *.webmanifest *.ico build
+cp *.png *.xml *.svg *.css *.webmanifest *.ico robots.txt build
 # https://github.com/cloudflare/workers-sdk/issues/3615
 sed 's/node_modules\///' index.html > build/index.html
 cp node_modules/@picocss/pico/css/pico.min.css build/@picocss/pico/css/
\ No newline at end of file