diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..14ec311
Binary files /dev/null and b/.DS_Store differ
diff --git a/config.yaml b/config.yaml
index 97222b8..098f4f3 100644
--- a/config.yaml
+++ b/config.yaml
@@ -10,7 +10,7 @@
 carpentry: cp
 
 # Overall title for pages.
-title: Introduction to Monte Carlo Simulations
+title: Introduction to Monte Carlo Simulations.
 
 # Date the lesson was created (this is empty by default)
 created: ~