diff --git a/serie2/ex3_1/.gitignore b/serie2/ex3_1/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..6b468b62a9884e67ca19b673f8e14e1931d65036
--- /dev/null
+++ b/serie2/ex3_1/.gitignore
@@ -0,0 +1 @@
+*.class