diff --git a/.gitignore b/.gitignore
index 14c36be..2771edf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
+/jyut6ping3.dict.yaml
 /jyut6ping3.simple.dict.yaml
 /background_scripts/dictionary.json.txt
-/process.py
+/preprocess.py
 /icons/icon.xcf
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..164f468
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# Inject Jyutping
+
+A browser extension to add Cantonese pronunciation (Jyutping) on Chinese characters, inspired by [EYHN/Furigana](https://github.com/EYHN/Furigana).
+
+## Build
+
+```
+python build/main.py
+```
diff --git a/build/main.py b/build/main.py
new file mode 100644
index 0000000..b6fb59a
--- /dev/null
+++ b/build/main.py
@@ -0,0 +1,28 @@
+import json
+from opencc import OpenCC
+import os
+
+# Preprocess
+os.system('wget -nc https://github.com/CanCLID/ToJyutping/raw/master/preprocess.py')
+os.system("sed -i 's/src\/ToJyutping\/jyut6ping3.simple.dict.yaml/jyut6ping3.simple.dict.yaml/' preprocess.py")
+os.system('python preprocess.py')
+
+# Build dictionary
+converter = OpenCC('t2s')
+
+d_t = {}
+d_cn = {}
+
+with open('jyut6ping3.simple.dict.yaml') as f:
+    for line in f:
+        k_t, v = line.rstrip('\n').split('\t')
+        k_cn = converter.convert(k_t)
+        d_t[k_t] = v
+        d_cn[k_cn] = v
+
+d = {**d_cn, **d_t}  # prefer t over cn
+l = list(d.items())
+
+with open('background_scripts/dictionary.json.txt', 'w') as f:
+    f.write(json.dumps(l, ensure_ascii=False).replace('], [', '],\n['))
+    f.write('\n')  # Add line break at the end of file