diff --git a/public/bundle.js b/public/bundle.js
index 8d3bdca..eda3a5e 100644
--- a/public/bundle.js
+++ b/public/bundle.js
@@ -1,3 +1,6 @@
+////
+// version: 1d6a7bc
+
 // src/js/dom.ts
 var cmdLine = $("command-line");
 var cmdInput = $("command-textbox");
diff --git a/scripts/build.sh b/scripts/build.sh
new file mode 100755
index 0000000..75a2c87
--- /dev/null
+++ b/scripts/build.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+SHA=$(git rev-parse --short HEAD)
+bun build ./src/js/main.js \
+            --outfile ./public/bundle.js \
+            --target browser
+printf "////\n// version: %s\n\n" "$SHA" | cat - ./public/bundle.js > ./public/bundle.tmp.js
+mv ./public/bundle.tmp.js ./public/bundle.js