diff --git a/index.yml b/index.yml
index 3828f31..95563a9 100644
--- a/index.yml
+++ b/index.yml
@@ -115,6 +115,10 @@
           url: week-2.html
         - lable: week 3
           url: week-3.html
+        - lable: week 4
+          url: week-4.html
+        - lable: week 5
+          url: week-5.html
     - lable: EPS20
       sidebar:
         - lable: index