diff --git a/presentation/codes/ex_rayon/.gitignore b/presentation/codes/ex_rayon/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..fa8d85ac52f19959d6fc9942c265708b4b3c2b04
--- /dev/null
+++ b/presentation/codes/ex_rayon/.gitignore
@@ -0,0 +1,2 @@
+Cargo.lock
+target