diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..dde3895
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.DS_Store
+*.pyc
diff --git a/ch-3/Robot.FCStd b/ch-3/Robot.FCStd
index 39a7116..5a561e4 100644
Binary files a/ch-3/Robot.FCStd and b/ch-3/Robot.FCStd differ