diff --git a/.dir-locals.el b/.dir-locals.el
new file mode 100644
index 00000000..967cb411
--- /dev/null
+++ b/.dir-locals.el
@@ -0,0 +1,3 @@
+((c++-mode . ((mode . clang-format-on-save))))
+
+((c-mode . ((mode c++-mode))))