diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
new file mode 100644
index 0000000..b5f5f03
--- /dev/null
+++ b/PREUPLOAD.cfg
@@ -0,0 +1,6 @@
+[Builtin Hooks]
+clang_format = true
+
+[Builtin Hooks Options]
+# Handle native codes only.
+clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp